Can not import copy_reg

Question

I am hosting my Web2py app on PythonAnyware and have an issue importing copy_reg which web2py apparently needs. In previous versions this was no issue.

The trace back is as follows: Traceback (most recent call last):

File "/home/richdijk/web2py/gluon/restricted.py", line 220, in restricted
  exec ccode in environment
File "/home/richdijk/web2py/applications/im/models/db.py", line 78, in <module>
  auth.define_tables(username=False, signature=False)
File "/home/richdijk/web2py/gluon/tools.py", line 1784, in define_tables
   format='%(first_name)s %(last_name)s (%(id)s)'))
File "/home/richdijk/web2py/gluon/dal.py", line 8223, in define_table
   table = self.lazy_define_table(tablename,*fields,**args)
File "/home/richdijk/web2py/gluon/dal.py", line 8260, in lazy_define_table
   polymodel=polymodel)
File "/home/richdijk/web2py/gluon/dal.py", line 1122, in create_table
   sql_fields_old = pickle.load(tfile)
File "/home/richdijk/web2py/gluon/custom_import.py", line 92, in custom_importer
  return base_importer(pname, globals, locals, fromlist, level)
ImportError: No module named copy_reg

Does anybody know the resolution for this? Thank you

Answer 1

For future reference:

Most often you should clear the cache and sessions. Use the appadmin interface to have a gui for this. This solved the issue for me more than once.

Sessions are pickled files which might lead to these problems. For example if you synchronize between different platforms, python versions and maybe sometimes even between upgrades on web2py (though i'm not certain on the latter).