com_error: (-2147221005, 'Invalid class string', None, None) when connecting to Ansys Desktop

[xiasitan]

I just tried to set up pyEPR with Ansys on a new PC. Created a new environment and installed all required packages. Now, when I try to connect to Ansys with epr.ProjectInfo,
pinfo = epr.ProjectInfo(project_path = os.getcwd(),
project_name = 'TripleCats',)

it connects to Ansys and finds the correct file path, but then spits out this error

com_error                                 Traceback (most recent call last)
~\anaconda3\envs\pyEPR\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatch(IDispatch, clsctx)
     88                 try:
---> 89                         IDispatch = pythoncom.connect(IDispatch)
     90                 except pythoncom.ole_error:

com_error: (-2147221005, 'Invalid class string', None, None)

During handling of the above exception, another exception occurred:

com_error                                 Traceback (most recent call last)
<ipython-input-3-f7191f53f00d> in <module>
----> 1 pinfo = epr.ProjectInfo(project_path = os.getcwd(), 
      2                          project_name = 'TripleCats',)

~\anaconda3\envs\pyEPR\lib\site-packages\pyEPR\project_info.py in __init__(self, project_path, project_name, design_name, setup_name, do_connect)
    209 
    210         if do_connect:
--> 211             self.connect()
    212             self.dissipative['pinfo'] = self
    213 

~\anaconda3\envs\pyEPR\lib\site-packages\pyEPR\project_info.py in connect(self)
    343         """
    344 
--> 345         self.connect_project()
    346         if not self.project:
    347             logger.info('\tConnection to Ansys NOT established.  \n')

~\anaconda3\envs\pyEPR\lib\site-packages\pyEPR\project_info.py in connect_project(self)
    239         logger.info('Connecting to Ansys Desktop API...')
    240 
--> 241         self.app, self.desktop, self.project = ansys.load_ansys_project(
    242             self.project_name, self.project_path)
    243 

~\anaconda3\envs\pyEPR\lib\site-packages\pyEPR\ansys.py in load_ansys_project(proj_name, project_path, extension)
   3092             )
   3093 
-> 3094     app = HfssApp()
   3095     logger.info("\tOpened Ansys App")
   3096 

~\anaconda3\envs\pyEPR\lib\site-packages\pyEPR\ansys.py in __init__(self, ProgID)
    379         '''
    380         super(HfssApp, self).__init__()
--> 381         self._app = Dispatch(ProgID)
    382 
    383     def get_app_desktop(self):

~\anaconda3\envs\pyEPR\lib\site-packages\win32com\client\__init__.py in Dispatch(dispatch, userName, resultCLSID, typeinfo, UnicodeToString, clsctx)
     93   """
     94   assert UnicodeToString is None, "this is deprecated and will go away"
---> 95   dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
     96   return __WrapDispatch(dispatch, userName, resultCLSID, typeinfo, clsctx=clsctx)
     97 

~\anaconda3\envs\pyEPR\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatchAndUserName(IDispatch, userName, clsctx)
    112         else:
    113                 userName = str(userName)
--> 114         return (_GetGoodDispatch(IDispatch, clsctx), userName)
    115 
    116 def _GetDescInvokeType(entry, invoke_type):

~\anaconda3\envs\pyEPR\lib\site-packages\win32com\client\dynamic.py in _GetGoodDispatch(IDispatch, clsctx)
     89                         IDispatch = pythoncom.connect(IDispatch)
     90                 except pythoncom.ole_error:
---> 91                         IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.IID_IDispatch)
     92         else:
     93                 # may already be a wrapped class.

com_error: (-2147221005, 'Invalid class string', None, None)

There was the same problem for the previous setup, which could be resolved by reinstalling everything from scratch. Ideas for an easier fix?

[github-actions]

👏👏👏 You are awesome! Thank you for making your first issue to pyEPR ' first issue

[zlatko-minev]

Try the Qiskit Metal slack channel, you can ask this there, https://qiskit.org/documentation/metal/ (Slack channel #metal in the qiskit workspace.)