diff --git a/orientation/orientation.py b/orientation/orientation.py
index 4dd2449..9374863 100644
--- a/orientation/orientation.py
+++ b/orientation/orientation.py
@@ -172,7 +172,7 @@ class Orientation:
         icon_path = ':/plugins/caliec/icon.png'
         self.add_action(
             icon_path,
-            text=self.tr(u'Créer le projet'),
+            text=self.tr('Créer le projet'),
             callback=self.run,
             parent=self.iface.mainWindow())
 
@@ -184,7 +184,7 @@ class Orientation:
         """Removes the plugin menu item and icon from QGIS GUI."""
         for action in self.actions:
             self.iface.removePluginMenu(
-                self.tr(u'&CaLiÉc'),
+                self.tr('CaLiÉc'),
                 action)
             self.iface.removeToolBarIcon(action)
 
@@ -201,7 +201,6 @@ class Orientation:
         tempdir = tempfile.TemporaryDirectory()
         styles_url = 'https://forge.chapril.org/linux_alpes/caliec/raw/branch/master/styles/'
         lambert93 = QgsCoordinateReferenceSystem("EPSG:2154")
-        wgs = QgsCoordinateReferenceSystem("EPSG:4326")
         wgspm = QgsCoordinateReferenceSystem("EPSG:3857")
         scr = wgspm
         project = QgsProject.instance()
@@ -212,6 +211,10 @@ class Orientation:
         context = dataobjects.createContext()
         context.setInvalidGeometryCheck(QgsFeatureRequest.GeometryNoCheck)
 
+        if len(project.mapLayersByName("OpenStreetMap")) == 0:
+            QMessageBox.warning(self.iface.mainWindow(), "Attention", "Affichez d'abord un fond Openstreetmap (menu XYZ tiles) et cadrez la zone voulue")
+            return
+
         # Correspondances des noms des couches et des styles:
         # "NOM_DE_LA_COUCHE_OSM": ("nom_du_style", "nom_du_layer")
         # Commenter les couches non désirées