Error while running Detectron2 code through spyder

[ghost]

I am able to execute the Detectron2 script once but the next time I try to run it I get this error. It works once after I restart the kernel.

File "/home/user/anaconda3/lib/python3.7/site-packages/spyder_kernels/customize/spydercustomize.py", line 827, in runfile
    execfile(filename, namespace)

  File "/home/user/anaconda3/lib/python3.7/site-packages/spyder_kernels/customize/spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "/home/user/Table_Structure_Extract/Detectron2/detectron2/detectron2/Scripts/Table_Instance1.py", line 23, in <module>
    from detectron2.engine import DefaultTrainer

  File "/home/user/Prateek_Data/Table_Structure_Extract/Detectron2/detectron2/detectron2/engine/__init__.py", line 12, in <module>
    from .defaults import *

  File "/home/user/Table_Structure_Extract/Detectron2/detectron2/detectron2/engine/defaults.py", line 23, in <module>
    from detectron2.checkpoint import DetectionCheckpointer

  File "/home/user/Table_Structure_Extract/Detectron2/detectron2/detectron2/checkpoint/__init__.py", line 6, in <module>
    from . import catalog as _UNUSED  # register the handler

  File "/home/user/Table_Structure_Extract/Detectron2/detectron2/detectron2/checkpoint/catalog.py", line 133, in <module>
    PathManager.register_handler(ModelCatalogHandler())

  File "/home/user/anaconda3/lib/python3.7/site-packages/fvcore/common/file_io.py", line 768, in register_handler
    assert prefix not in PathManager._PATH_HANDLERS

AssertionError

[dips4717]

@stepovr , are you able to solve this issue? I have a similar issue. It works but every time I need to restart kernel in Spyder.