ImportError: No module named mitxgraders

[eazaika]

Hi,
I use mitxgraders in open edX, load this to Studio in Files of each course. All works fine many years, but now we gets import error sometimes:

2025-12-02 19:26:26,880 WARNING 12105 [codejail] safe_exec.py:248 - Using codejail/safe_exec.py:not_safe_exec for af3b88bbd53b4838bae5b78f59d4b176
2025-12-02 19:26:26,882 ERROR 12105 [capa.capa_problem] capa_problem.py:887 - Error while execing script code:
from mitxgraders import *
Traceback (most recent call last):
  File "/edx/app/edxapp/edx-platform/common/lib/capa/capa/capa_problem.py", line 884, in _extract_context
    unsafely=self.capa_system.can_execute_unsafe_code(),
  File "/edx/app/edxapp/edx-platform/common/lib/capa/capa/safe_exec/safe_exec.py", line 157, in safe_exec
    raise e
SafeExecException: ImportError: No module named mitxgraders
2025-12-02 19:26:26,882 ERROR 12105 [xmodule.x_module] x_module.py:1233 - Error creating xmodule
Traceback (most recent call last):
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/x_module.py", line 1221, in _xmodule
    for_parent=self.get_parent() if self.has_cached_parent else None
  File "/edx/app/edxapp/venvs/edxapp/src/xblock/xblock/runtime.py", line 638, in construct_xblock_from_class
    *args, **kwargs
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/capa_base.py", line 249, in __init__
    self.lcp = self.new_lcp(self.get_state_for_lcp())
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/capa_base.py", line 344, in new_lcp
    capa_module=self,  # njp
  File "/edx/app/edxapp/edx-platform/common/lib/capa/capa/capa_problem.py", line 194, in __init__
    self.context = self._extract_context(self.tree)
  File "/edx/app/edxapp/edx-platform/common/lib/capa/capa/capa_problem.py", line 889, in _extract_context
    raise responsetypes.LoncapaProblemError(msg)
Exception: cannot create LoncapaProblem block-v1:kafedra-inostrannyh-yazykov+ProfInYaz+fall_2025+type@problem+block@af3b88bbd53b4838bae5b78f59d4b176: Error while executing script code: ImportError: No module named mitxgraders

Mitxgraders files are alright. Reuploading this to course's files is not helping.
Restart lms process via supervisor helps.
Any ideas very appreciates