Add a reason for why an Addon can not be loaded. This change gives a more detailed explanation of the issue and may help the Addon Developer to identify what exactly needs to be changed.

The current message 'addon not loaded' is a bit too sparse.

Differential Revision: https://developer.blender.org/D11655

release/scripts/modules/addon_utils.py

@@ -358,7 +358,8 @@ def enable(module_name, *, default_set=False, persistent=False, handle_error=Non
         except Exception as ex:
             # if the addon doesn't exist, don't print full traceback
             if type(ex) is ImportError and ex.name == module_name:
-                print("addon not found:", repr(module_name))
+                print("addon not loaded:", repr(module_name))
+                print("cause:", str(ex))
             else:
                 handle_error(ex)