diff --git a/backend/report.html b/backend/report.html
index 2b85da6..87e9e5d 100644
--- a/backend/report.html
+++ b/backend/report.html
@@ -328,7 +328,7 @@ div.media {
   </head>
   <body>
     <h1 id="title">Backend Testing Report</h1>
-    <p>Report generated on 28-Jan-2025 at 12:37:35 by <a href="https://pypi.python.org/pypi/pytest-html">pytest-html</a>
+    <p>Report generated on 28-Jan-2025 at 12:52:37 by <a href="https://pypi.python.org/pypi/pytest-html">pytest-html</a>
         v4.1.1</p>
     <div id="environment-header">
       <h2>Environment</h2>
@@ -382,18 +382,18 @@ div.media {
         <h2>Summary</h2>
         <div class="additional-summary prefix">
         </div>
-        <p class="run-count">0/0 test done.</p>
+        <p class="run-count">1 test took 00:00:31.</p>
         <p class="filter">(Un)check the boxes to filter the results.</p>
         <div class="summary__reload">
-          <div class="summary__reload__button " onclick="location.reload()">
+          <div class="summary__reload__button hidden" onclick="location.reload()">
             <div>There are still tests running. <br />Reload this page to get the latest results!</div>
           </div>
         </div>
         <div class="summary__spacer"></div>
         <div class="controls">
           <div class="filters">
-            <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="failed" disabled/>
-            <span class="failed">0 Failed,</span>
+            <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="failed" />
+            <span class="failed">1 Failed,</span>
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="passed" disabled/>
             <span class="passed">0 Passed,</span>
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="skipped" disabled/>
@@ -432,7 +432,7 @@ div.media {
     </table>
   </body>
   <footer>
-    <div id="data-container" data-jsonblob="{&#34;environment&#34;: {&#34;Python&#34;: &#34;3.12.3&#34;, &#34;Platform&#34;: &#34;Linux-6.8.0-51-generic-x86_64-with-glibc2.39&#34;, &#34;Packages&#34;: {&#34;pytest&#34;: &#34;8.3.4&#34;, &#34;pluggy&#34;: &#34;1.5.0&#34;}, &#34;Plugins&#34;: {&#34;html&#34;: &#34;4.1.1&#34;, &#34;anyio&#34;: &#34;4.8.0&#34;, &#34;metadata&#34;: &#34;3.1.1&#34;}}, &#34;tests&#34;: {}, &#34;renderCollapsed&#34;: [&#34;passed&#34;], &#34;initialSort&#34;: &#34;result&#34;, &#34;title&#34;: &#34;Backend Testing Report&#34;}"></div>
+    <div id="data-container" data-jsonblob="{&#34;environment&#34;: {&#34;Python&#34;: &#34;3.12.3&#34;, &#34;Platform&#34;: &#34;Linux-6.8.0-51-generic-x86_64-with-glibc2.39&#34;, &#34;Packages&#34;: {&#34;pytest&#34;: &#34;8.3.4&#34;, &#34;pluggy&#34;: &#34;1.5.0&#34;}, &#34;Plugins&#34;: {&#34;html&#34;: &#34;4.1.1&#34;, &#34;anyio&#34;: &#34;4.8.0&#34;, &#34;metadata&#34;: &#34;3.1.1&#34;}}, &#34;tests&#34;: {&#34;src/tests/test_main.py::test_turckheim&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Failed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_turckheim&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Failed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_turckheim&lt;/td&gt;&#34;, &#34;&lt;td&gt;start (0 | 0) - 6 - H\u00f4tel des Deux-Clefs (217 | 5) - 1 - H\u00f4tel de ville (238 | 5) - 6 - finish (0 | 0) - 0&lt;/td&gt;&#34;, &#34;&lt;td&gt;23 min&lt;/td&gt;&#34;, &#34;&lt;td&gt;20 min&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;00:00:31&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;client = &amp;lt;starlette.testclient.TestClient object at 0x7678d3c99400&amp;gt;\nrequest = &amp;lt;FixtureRequest for &amp;lt;Function test_turckheim&amp;gt;&amp;gt;\n\n    def test_turckheim(client, request):    # pylint: disable=redefined-outer-name\n        &amp;quot;&amp;quot;&amp;quot;\n        Test n\u00b01 : Custom test in Turckheim to ensure small villages are also supported.\n    \n        Args:\n            client:\n            request:\n        &amp;quot;&amp;quot;&amp;quot;\n        start_time = time.time()  # Start timer\n        duration_minutes = 20\n    \n        response = client.post(\n            &amp;quot;/trip/new&amp;quot;,\n            json={\n                &amp;quot;preferences&amp;quot;: {&amp;quot;sightseeing&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;sightseeing&amp;quot;, &amp;quot;score&amp;quot;: 5},\n                &amp;quot;nature&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;nature&amp;quot;, &amp;quot;score&amp;quot;: 5},\n                &amp;quot;shopping&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;shopping&amp;quot;, &amp;quot;score&amp;quot;: 0},\n                &amp;quot;max_time_minute&amp;quot;: duration_minutes,\n                &amp;quot;detour_tolerance_minute&amp;quot;: 0},\n                &amp;quot;start&amp;quot;: [48.084588, 7.280405]\n                }\n            )\n        result = response.json()\n        landmarks = load_trip_landmarks(client, result[&amp;#x27;first_landmark_uuid&amp;#x27;])\n    \n    \n        # Get computation time\n        comp_time = time.time() - start_time\n    \n        # Add details to report\n        log_trip_details(request, landmarks, result[&amp;#x27;total_time&amp;#x27;], duration_minutes)\n    \n        # for elem in landmarks :\n        #     print(elem)\n    \n        # checks :\n        assert response.status_code == 200  # check for successful planning\n        assert isinstance(landmarks, list)  # check that the return type is a list\n        assert len(landmarks) &amp;gt; 2           # check that there is something to visit\n&amp;gt;       assert comp_time &amp;lt; 30, f&amp;quot;Computation time exceeded 30 seconds: {comp_time:.2f} seconds&amp;quot;\nE       AssertionError: Computation time exceeded 30 seconds: 30.69 seconds\nE       assert 30.685150384902954 &amp;lt; 30\n\nsrc/tests/test_main.py:54: AssertionError\n\n------------------------------ Captured log call -------------------------------\nDEBUG    asyncio:selector_events.py:64 Using selector: EpollSelector\nINFO     src.main:main.py:66 No end coordinates provided. Using start=end.\nDEBUG    src.utils.landmarks_manager:landmarks_manager.py:76 Starting to fetch landmarks...\nDEBUG    src.utils.landmarks_manager:landmarks_manager.py:88 Fetching sightseeing landmarks...\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[tourism~&amp;quot;^(museum|attraction|gallery|artwork|aquarium)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[tourism~&amp;quot;^(museum|attraction|gallery|artwork|aquarium)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[historic](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[historic](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[amenity~&amp;quot;^(planetarium|place_of_worship|fountain|townhall)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[amenity~&amp;quot;^(planetarium|place_of_worship|fountain|townhall)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[water=reflecting_pool](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[water=reflecting_pool](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[bridge~&amp;quot;^(aqueduct|viaduct|boardwalk|cantilever|abandoned)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[bridge~&amp;quot;^(aqueduct|viaduct|boardwalk|cantilever|abandoned)$&amp;quot;](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[building=cathedral](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[building=cathedral](if: count_tags()&amp;gt;5)(48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nDEBUG    src.utils.landmarks_manager:landmarks_manager.py:204 Fetched 9 landmarks of type sightseeing in (48.079458619727674, 7.272726663391359, 48.08971738027232, 7.288083336608641)\nINFO     src.utils.landmarks_manager:landmarks_manager.py:91 Found 9 sightseeing landmarks\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[&amp;quot;historic&amp;quot;~&amp;quot;^(monument|building|yes)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center;\nINFO     src.utils.cluster_manager:cluster_manager.py:145 Found 0 sightseeing clusters.\nDEBUG    src.utils.landmarks_manager:landmarks_manager.py:100 Fetching nature landmarks...\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[leisure=park](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[leisure=park](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[geological](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[geological](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[natural~&amp;quot;^(geyser|hot_spring|arch|volcano|stone)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[natural~&amp;quot;^(geyser|hot_spring|arch|volcano|stone)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[tourism~&amp;quot;^(alpine_hut|viewpoint|zoo|resort|picnic_site)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[tourism~&amp;quot;^(alpine_hut|viewpoint|zoo|resort|picnic_site)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);node[tourism~&amp;quot;^(alpine_hut|viewpoint|zoo|resort|picnic_site)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[water~&amp;quot;^(pond|lake|river|basin|stream|lagoon|rapids)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[water~&amp;quot;^(pond|lake|river|basin|stream|lagoon|rapids)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nINFO     src.overpass.overpass:overpass.py:84 Cache miss. Fetching data through Overpass.\nDEBUG    src.overpass.overpass:overpass.py:85 Query = [out:json];(way[waterway~&amp;quot;^(waterfall|river|canal|dam|dock|boatyard)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641);relation[waterway~&amp;quot;^(waterfall|river|canal|dam|dock|boatyard)$&amp;quot;](48.079458619727674,7.272726663391359,48.08971738027232,7.288083336608641););out ids center tags;\nDEBUG    src.utils.landmarks_manager:landmarks_manager.py:204 Fetched 10 landmarks of type nature in (48.079458619727674, 7.272726663391359, 48.08971738027232, 7.288083336608641)\nINFO     src.utils.landmarks_manager:landmarks_manager.py:103 Found 10 nature landmarks\nINFO     src.main:main.py:103 Fetched 12 landmarks in  \t: 12.036 seconds\nDEBUG    src.optimization.optimizer:optimizer.py:597 First results are out. Looking out for circles and correcting.\nINFO     src.optimization.optimizer:optimizer.py:637 Re-optimized 0 times, objective value : 455\nDEBUG    src.optimization.refiner:refiner.py:345 Using 5 minor landmarks around the predicted path\nDEBUG    src.optimization.optimizer:optimizer.py:597 First results are out. Looking out for circles and correcting.\nINFO     src.optimization.optimizer:optimizer.py:637 Re-optimized 0 times, objective value : 455\nDEBUG    src.main:main.py:129 First stage optimization\t: 0.064 seconds\nDEBUG    src.main:main.py:130 Second stage optimization\t: 0.029 seconds\nINFO     src.main:main.py:131 Total computation time\t: 0.092 seconds\nINFO     src.main:main.py:136 Generated a trip of 23 minutes with 4 landmarks in 12.128 seconds.\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 17697322ddb543cd28c7d672da5b0a42\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 2d4f31d2bcc071a8ae54824e88b0b71f\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for b038bd8d4d6e49b077d4475aef2dbec7\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for fc8f85cdaba838cf56c61bf67d3d073f\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 57782ff2b60d1b4b56fae34a135862f8\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for b2fd047a07f9563c8c0925aad9d61052\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 36c2ed8cfba53833c4be58184562e315\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for bfec290793bde2bf9796d5dda23d0122\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 7ee38297ba20e3bc47b984dce2785e22\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for b7989cbe1aff4f6d0054a6c5550d3fcc\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 7f98015c7bc3a9100e10bc1c1ddfa572\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for 43424dbebba69d06a66a34728c3bb93e\nDEBUG    src.overpass.overpass:overpass.py:112 Cache set for b7d4ee874adac132bc9e80d7172fab8e\nINFO     httpx:_client.py:1025 HTTP Request: POST http://testserver/trip/new &amp;quot;HTTP/1.1 200 OK&amp;quot;\n\n&#34;}]}, &#34;renderCollapsed&#34;: [&#34;passed&#34;], &#34;initialSort&#34;: &#34;result&#34;, &#34;title&#34;: &#34;Backend Testing Report&#34;}"></div>
     <script>
       (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 const { getCollapsedCategory, setCollapsedIds } = require('./storage.js')
diff --git a/backend/src/main.py b/backend/src/main.py
index aa39b6f..bb063fa 100644
--- a/backend/src/main.py
+++ b/backend/src/main.py
@@ -40,7 +40,8 @@ app = FastAPI(lifespan=lifespan)
 @app.post("/trip/new")
 def new_trip(preferences: Preferences,
              start: tuple[float, float],
-             end: tuple[float, float] | None = None) -> Trip:
+             end: tuple[float, float] | None = None, 
+             background_tasks: BackgroundTasks = None) -> Trip:
     """
     Main function to call the optimizer.
 
@@ -135,7 +136,7 @@ def new_trip(preferences: Preferences,
     trip = Trip.from_linked_landmarks(linked_tour, cache_client)
     logger.info(f'Generated a trip of {trip.total_time} minutes with {len(refined_tour)} landmarks in {round(t_generate_landmarks + t_first_stage + t_second_stage,3)} seconds.')
 
-    background_tasks = BackgroundTasks(fill_cache())
+    background_tasks.add(fill_cache())
 
     return trip
 
diff --git a/backend/src/overpass/overpass.py b/backend/src/overpass/overpass.py
index edcb41b..f49b439 100644
--- a/backend/src/overpass/overpass.py
+++ b/backend/src/overpass/overpass.py
@@ -102,6 +102,7 @@ class Overpass :
             request = urllib.request.Request(self.overpass_url, data=data, headers=self.headers)
 
             with urllib.request.urlopen(request) as response:
+
                 # Convert the HTTPResponse to a string and load data
                 response_data = response.read().decode('utf-8')  
                 data = json.loads(response_data)
@@ -110,7 +111,6 @@ class Overpass :
                 elements = data.get('elements', [])
                 self.caching_strategy.set(cache_key, elements)
                 self.logger.debug(f'Cache set for {cache_key}')
-
         except urllib.error.URLError as e:
             raise ConnectionError(f"Error connecting to Overpass API: {e}") from e
         except Exception as exc :
@@ -333,7 +333,11 @@ def fill_cache():
 
                 # Read the whole file content as a string
                 with open(entry.path, 'r') as f:
-                    json_data = json.load(f)
+                    try :
+                        json_data = json.load(f)
+                    except Exception as exc :
+                        raise json.JSONDecodeError(f'Failed to parse file {f}') from exc
+        
 
                 # Fill the cache with the query and key
                 overpass.fill_cache(json_data)
diff --git a/backend/src/tests/test_main.py b/backend/src/tests/test_main.py
index a865942..5c546a9 100644
--- a/backend/src/tests/test_main.py
+++ b/backend/src/tests/test_main.py
@@ -56,7 +56,7 @@ def test_turckheim(client, request):    # pylint: disable=redefined-outer-name
     assert duration_minutes*1.2 > result['total_time'], f"Trip too long: {result['total_time']} instead of {duration_minutes}"
     # assert 2!= 3
 
-
+'''
 def test_bellecour(client, request) :   # pylint: disable=redefined-outer-name
     """
     Test n°2 : Custom test in Lyon centre to ensure proper decision making in crowded area.
@@ -342,3 +342,4 @@ def test_shopping(client, request) :   # pylint: disable=redefined-outer-name
     assert comp_time < 30, f"Computation time exceeded 30 seconds: {comp_time:.2f} seconds"
     assert duration_minutes*0.8 < result['total_time'], f"Trip too short: {result['total_time']} instead of {duration_minutes}"
     assert duration_minutes*1.2 > result['total_time'], f"Trip too long: {result['total_time']} instead of {duration_minutes}"
+'''
\ No newline at end of file
