diff --git a/index.html b/index.html
index 5185d5a..0058bd9 100644
--- a/index.html
+++ b/index.html
@@ -711,7 +711,6 @@
                         </button>
                     </div>
                     <div class="modal-body">
-                        <p id="nogoError" class="invalid-feedback" style="display: none"></p>
                         <form name="loadNogosForm" id="loadNogosForm">
                             <fieldset>
                                 <legend data-i18n="loadNogos.source">Source</legend>
@@ -795,6 +794,8 @@
                         </form>
                     </div>
                     <div class="modal-footer">
+                        <p id="nogoError" class="invalid-feedback" style="display: none"></p>
+
                         <button type="button" class="btn btn-secondary" data-i18n="modal.close" data-dismiss="modal">
                             Close
                         </button>
diff --git a/js/plugin/NogoAreas.js b/js/plugin/NogoAreas.js
index 985ce18..dec430a 100644
--- a/js/plugin/NogoAreas.js
+++ b/js/plugin/NogoAreas.js
@@ -197,7 +197,9 @@ BR.NogoAreas = L.Control.extend({
                     resolve(reader.result);
                 };
                 reader.onerror = function () {
-                    self.displayUploadError('Could not load file: ' + reader.error.message);
+                    self.displayUploadError(
+                        i18next.t('loadNogos.error.loading-file-error', { err: reader.error.message })
+                    );
                 };
 
                 reader.readAsText(nogoFile);
@@ -206,25 +208,25 @@ BR.NogoAreas = L.Control.extend({
             });
         } else {
             // FIXME: use form validator instead
-            self.displayUploadError('Missing file or URL.');
+            self.displayUploadError(i18next.t('loadNogos.error.missing-file-url'));
             return false;
         }
         var nogoWeight = parseFloat($('#nogoWeight').val());
         if (isNaN(nogoWeight)) {
             // FIXME: use form validator instead
-            self.displayUploadError('Missing default nogo weight.');
+            self.displayUploadError(i18next.t('loadNogos.error.missing-default-nogo-weight'));
             return false;
         }
         var nogoRadius = parseFloat($('#nogoRadius').val());
         if (isNaN(nogoRadius) || nogoRadius < 0) {
             // FIXME: use form validator instead
-            self.displayUploadError('Invalid default nogo radius.');
+            self.displayUploadError(i18next.t('loadNogos.error.invalid-default-nogo-radius'));
             return false;
         }
         var nogoBuffer = parseFloat($('#nogoBuffer').val());
         if (isNaN(nogoBuffer)) {
             // FIXME: use form validator instead
-            self.displayUploadError('Invalid nogo buffering radius.');
+            self.displayUploadError(i18next.t('loadNogos.error.invalid-nogo-buffering-radius'));
             return false;
         }
 
@@ -243,7 +245,7 @@ BR.NogoAreas = L.Control.extend({
             });
 
             if (cleanedGeoJSONFeatures.length === 0) {
-                self.displayUploadError('No valid area found in provided input.');
+                self.displayUploadError(i18next.t('loadNogos.error.no-valid-area'));
                 return false;
             }
 
@@ -268,18 +270,31 @@ BR.NogoAreas = L.Control.extend({
             nogosPoints = nogosPoints.filter(function (e) {
                 return e;
             });
-            self.setOptions({
-                nogos: nogosPoints,
-                polygons: geoJSON.getLayers().filter(function (e) {
-                    return e.feature.geometry.type === 'Polygon';
-                }),
-                polylines: geoJSON.getLayers().filter(function (e) {
-                    return e.feature.geometry.type === 'LineString';
-                }),
-            });
-            self._fireUpdate();
-            self.displayUploadError(undefined);
-            $('#loadNogos').modal('hide');
+            try {
+                self.setOptions({
+                    nogos: nogosPoints,
+                    polygons: geoJSON.getLayers().filter(function (e) {
+                        return e.feature.geometry.type === 'Polygon';
+                    }),
+                    polylines: geoJSON.getLayers().filter(function (e) {
+                        return e.feature.geometry.type === 'LineString';
+                    }),
+                });
+                self._fireUpdate();
+                self.displayUploadError(undefined);
+                $('#loadNogos').modal('hide');
+            } catch (err) {
+                if (err.name === 'NS_ERROR_MALFORMED_URI') {
+                    self.displayUploadError(i18next.t('loadNogos.error.loading-file-too-big'));
+                } else {
+                    self.displayUploadError(i18next.t('loadNogos.error.loading-file-unexpected'));
+                }
+                // fire a fake empty nogos before removing layers from map
+                // because it will automatically refresh the URL, and that will
+                // fail if we do not empty nogos first
+                self.fire('update', { options: { nogos: [], polygons: [], polylines: [] } });
+                self._clear();
+            }
         });
         return false;
     },
diff --git a/locales/en.json b/locales/en.json
index cecdb83..7c3b784 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -84,6 +84,16 @@
   },
   "loadNogos": {
     "defaultProperties": "Default properties",
+    "error": {
+      "invalid-default-nogo-radius": "Invalid default nogo radius.",
+      "invalid-nogo-buffering-radius": "Invalid nogo buffering radius.",
+      "loading-file-error": "Could not load file: {{err}}.",
+      "loading-file-too-big": "Too many nogo areas in this file! Please simplify the geometry and/or reduce the number of zones.",
+      "loading-file-unexpected": "Unexpected error when loading this file.",
+      "missing-default-nogo-weight": "Missing default nogo weight.",
+      "missing-file-url": "Missing file or URL.",
+      "no-valid-area": "No valid area found in provided input."
+    },
     "file": "File (.geojson)",
     "load": "Load",
     "nogoBuffer": "Buffer no-go areas (in meters)",