log external styles names when they fail to load

src/blenderbim/blenderbim/bim/module/style/operator.py

@@ -330,16 +330,21 @@ class ActivateExternalStyle(bpy.types.Operator, tool.Ifc.Operator):
         style_path = Path(tool.Ifc.resolve_uri(external_style.Location))
 
         if style_path.suffix != ".blend":
-            self.report({"ERROR"}, f"Error loading external style - only Blender external styles are supported")
+            self.report(
+                {"ERROR"},
+                f"Error loading external style for \"{material.name}\" - only Blender external styles are supported",
+            )
             return {"CANCELLED"}
 
         if not style_path.exists():
-            self.report({"ERROR"}, f"Error loading external style - cannot find file: '{style_path}'")
+            self.report(
+                {"ERROR"}, f"Error loading external style for \"{material.name}\" - cannot find file: '{style_path}'"
+            )
             return {"CANCELLED"}
 
         db = tool.Blender.append_data_block(str(style_path), data_block_type, data_block)
         if not db["data_block"]:
-            self.report({"ERROR"}, f"Error loading external style - {db['msg']}")
+            self.report({"ERROR"}, f"Error loading external style for \"{material.name}\" - {db['msg']}")
             return {"CANCELLED"}
 
         self.copy_material_attributes(db["data_block"], material)

src/blenderbim/blenderbim/bim/module/style/prop.py

@@ -259,7 +259,7 @@ def update_shading_style(self, context):
             try:
                 bpy.ops.bim.activate_external_style(material_name=blender_material.name)
             except RuntimeError as error:
-                if str(error).startswith("Error: Error loading external style - "):
+                if str(error).startswith("Error: Error loading external style for "):
                     return
                 raise error