I’m getting the below error (AttributeError: 'NoneType' object has no attribute 'cdb_file') when attemping to save a model from “Save Model” button on the MedCAT trainer landing page, following a bunch of submitted annotations (with “train on submit” enabled via admin).
This was incremental training of the v2_Snomed2025 publicly available MedCATv2 model. I can see a cdb in the admin page (/home/api/media/v2_Snomed2025_MIMIC_IV_bbe806e192df009f_9Xv5lF5/cdb), so I wouldn’t expect this to be an issue?
Any suggestions for debugging would be welcome, thank you!
medcat v2.6.0, trainer image built from source.
nginx-1 | 172.18.0.1 - - [02/Apr/2026:15:24:05 +0000] "POST /api/save-models/ HTTP/1.1" 500 91672 "http://localhost:8001/" ""
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception
medcattrainer-1 | [medcattrainer] raise exc
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 512, in dispatch
medcattrainer-1 | [medcattrainer] response = handler(request, *args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/decorators.py", line 50, in handler
medcattrainer-1 | [medcattrainer] return func(*args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/api/api/views.py", line 566, in save_models
medcattrainer-1 | [medcattrainer] cat.cdb.save(project.concept_db.cdb_file.path)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] AttributeError: 'NoneType' object has no attribute 'cdb_file'
medcattrainer-1 | [medcattrainer] ERROR 2026-04-02 15:24:05,131 log.py l:253:Internal Server Error: /api/save-models/
medcattrainer-1 | [medcattrainer] Traceback (most recent call last):
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/django/core/handlers/exception.py", line 55, in inner
medcattrainer-1 | [medcattrainer] response = get_response(request)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/django/core/handlers/base.py", line 197, in _get_response
medcattrainer-1 | [medcattrainer] response = wrapped_callback(request, *callback_args, **callback_kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/django/views/decorators/csrf.py", line 65, in _view_wrapper
medcattrainer-1 | [medcattrainer] return view_func(request, *args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/django/views/generic/base.py", line 105, in view
medcattrainer-1 | [medcattrainer] return self.dispatch(request, *args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 515, in dispatch
medcattrainer-1 | [medcattrainer] response = self.handle_exception(exc)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 475, in handle_exception
medcattrainer-1 | [medcattrainer] self.raise_uncaught_exception(exc)
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 486, in raise_uncaught_exception
medcattrainer-1 | [medcattrainer] raise exc
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 512, in dispatch
medcattrainer-1 | [medcattrainer] response = handler(request, *args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/decorators.py", line 50, in handler
medcattrainer-1 | [medcattrainer] return func(*args, **kwargs)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] File "/home/api/api/views.py", line 566, in save_models
medcattrainer-1 | [medcattrainer] cat.cdb.save(project.concept_db.cdb_file.path)
medcattrainer-1 | [medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^
medcattrainer-1 | [medcattrainer] AttributeError: 'NoneType' object has no attribute 'cdb_file'