Greetings,

I am getting the following error, any suggestions would be welcomed.
When running:  

deleteVersionStamp     self.session.delete(rec)   File 
“\Externals\win32\Lib\site-packages\sqlalchemy\orm\scoping.py”, line 162, 

in do     return getattr(self.registry(), name)(*args, **kwargs)   File " 
\Externals\win32\Lib\site-packages\sqlalchemy\orm\session.py", line 2014, 

in delete     util.raise_(   File " 
\Externals\win32\Lib\site-packages\sqlalchemy\util\compat.py", line 178, in 
raise_     raise exception sqlalchemy.orm.exc.UnmappedInstanceError: Class 
'builtins.NoneType' is not mapped

Class 'builtins.NoneType' is not mapped 
Is this a permissions error or something else??

Thanks,
Clive

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