topic Re: cx_Freeze: Python error in main script when existing Fusion 360 in Fusion Support Forum

cx_Freeze: Python error in main script when existing Fusion 360

philip_3263 — Fri, 30 Apr 2021 08:48:56 GMT

After one of the latest Fusion 360 updates, I now get an error message whenever I exit Fusion 360. I am still able to get my work done, and save work, and everything in Fusion 360 seems to be working fine. Here is text from the title bar of the error dialog followed by the exact text of the error message.

cx_Freeze: Python error in main script

Traceback (most recent call last):
File
"c:\jenkins\workspace\fusion\3P\CX_FREEZE\5.1.1\WIN64\lib\cx_Freeze\initscripts\_startup_.py", line 14, in run

File
"c:\jenkins\workspace\fusion\3P\CX_FREEZE\5.1.1\WIN64\lib\cx_Freeze\initscripts\Console.py", line 26, in run

File "streamer.py", line 22 in <modlue>

ModuleNotFoundError: No module named 'adsk'

Re: cx_Freeze: Python error in main script when existing Fusion 360

dsouzasujay — Wed, 05 May 2021 00:20:09 GMT

Hi @philip_3263 ,

Please follow below steps

Make sure you have all Windows update
Uninstall Fusion 360 with Automatic uninstall tool
Turn off your firewall and Antivirus temporarily during installing.
Install Fusion 360 again.

Re: cx_Freeze: Python error in main script when existing Fusion 360

philip_3263 — Wed, 05 May 2021 10:09:59 GMT

Thank You!

Re: cx_Freeze: Python error in main script when existing Fusion 360

jfpatterson — Sun, 07 Nov 2021 21:51:02 GMT

When I uninstall Fusion 360 the same error comes up as before and it appears that the uninstall function does not work for this. My Windows 10 is updated.

Re: cx_Freeze: Python error in main script when existing Fusion 360

daviddamiangonzalez — Tue, 23 Aug 2022 00:52:10 GMT

The same thing is happening to me now. I checked for updates and I had one, after the update I can't uninstall it because the same error comes up.

Re: cx_Freeze: Python error in main script when existing Fusion 360

magic_supper — Fri, 05 Sep 2025 03:52:31 GMT

Yeah these guys are worthless

Re: cx_Freeze: Python error in main script when existing Fusion 360

jhonsmithy564 — Fri, 05 Sep 2025 05:16:40 GMT

Even though this is a Fusion 360 issue, it reminds me of how important it is to have reliable systems in place just like Browns Heating ensures their HVAC systems run smoothly and efficiently. Keeping everything updated and maintained can prevent small problems from becoming bigger headaches.

Re: cx_Freeze: Python error in main script when existing Fusion 360

dsouzasujay — Sat, 06 Sep 2025 15:44:55 GMT

Hi @jhonsmithy564 @philip_3263 @magic_supper @daviddamiangonzalez @jfpatterson

I apologize for the delayed response. Could you please follow the instructions listed in the article below and see if that resolves the issue?

"Cx_Freeze: Python error in main script" in Autodesk Fusion

Re: cx_Freeze: Python error in main script when existing Fusion 360

jfpatterson — Sun, 07 Sep 2025 23:00:26 GMT

Hi dsouzasujay, I have read the article and unfortunately, my CNC machine
is a Windows 11 that cannot be updated but I have the same problem with
Fusion 360 in my iMac. It is not unbearable, I just noticed the issue.
Thank you for lending a helping hand.
Jim Patterson

Re: cx_Freeze: Python error in main script when existing Fusion 360

dsouzasujay — Mon, 08 Sep 2025 14:09:40 GMT

Hi @jfpatterson,

Could you please share your diagnostic log files?
How to collect the Diagnostic Log Files for Fusion

Also, please try How to do a manual clean uninstall of Autodesk Fusion and check if this works.