Traceback (most recent call last):
  File "/home/weltere/xraylarch/lib/python3.7/ctypes/__init__.py", line 97, in CFUNCTYPE
    return _c_functype_cache[(restype, argtypes, flags)]
KeyError: (None, (<class 'epics.dbr.access_rights_handler_args'>,), 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/weltere/xraylarch/bin/larch", line 11, in <module>
    load_entry_point('xraylarch==0.9.46', 'console_scripts', 'larch')()
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/pkg_resources/__init__.py", line 489, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2843, in load_entry_point
    return ep.load()
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2434, in load
    return self.resolve()
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2440, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/larch/__init__.py", line 50, in <module>
    from . import builtins
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/larch/builtins.py", line 33, in <module>
    from . import epics
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/larch/epics/__init__.py", line 9, in <module>
    import epics
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/epics/__init__.py", line 29, in <module>
    from . import ca
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/epics/ca.py", line 643, in <module>
    dbr.access_rights_handler_args)
  File "/home/weltere/xraylarch/lib/python3.7/site-packages/epics/dbr.py", line 325, in make_callback
    return ctypes.CFUNCTYPE(None, args)(func)
  File "/home/weltere/xraylarch/lib/python3.7/ctypes/__init__.py", line 99, in CFUNCTYPE
    class CFunctionType(_CFuncPtr):
TypeError: item 1 in _argtypes_ passes a struct/union with a bitfield by value, which is unsupported.