Here is the anonymised version of Check_MK’s crash report including Stacktrace:
Crash Report
Exeption:
ValueError (unique identifier not set)
Traceback:
File "/omd/sites/prod/lib/python3/cmk/gui/wsgi/applications/rest_api.py", line 401, in _wsgi_app
return wsgi_app(environ, start_response)
File "/omd/sites/prod/lib/python3/cmk/gui/wsgi/applications/rest_api.py", line 205, in __call__
wsgi_app = self.func(ParameterDict(path_args))
File "/omd/sites/prod/lib/python3/cmk/gui/plugins/openapi/restful_objects/decorators.py", line 479, in _validating_wrapper
response = self.func(param)
File "/omd/sites/prod/lib/python3/cmk/gui/plugins/openapi/endpoints/folder_config.py", line 274, in list_folders
return constructors.serve_json(_folders_collection(folders, params['show_hosts']))
File "/omd/sites/prod/lib/python3/cmk/gui/plugins/openapi/endpoints/folder_config.py", line 311, in _folders_collection
'id': folder.id()
File "/omd/sites/prod/lib/python3/cmk/gui/watolib/hosts_and_folders.py", line 131, in id
raise ValueError("unique identifier not set")
I hope this helps. Cheers