Internal Error, Slicer will not open  

New Member

Getting an error upon booting the program that says:

Internal error: Error parsing Prusaslicer config file, it is probably corrupted. Try to manually delete the file to recover from the error. Your user profiles will not be affected. 


<unspecified file> (20): '=' character not found in line 


I don't know what file it is or isn't reading, I haven't moved the program folder or anything. 

I run Windows 10. 

Posted : 06/02/2021 2:48 am
Illustrious Member

Can I assume windows?

Chuck H
3D Printer Review Blog...
Posted : 06/02/2021 3:06 am
Estimable Member

The AppData folder is normally hidden but you can enable display using View\Options\Change folder and search options then selecting View in the Folders Option finally click on Show hidden files, folders and drives.  From the C drive you should now be able to drill down to C:\Users\USERNAME\AppData\Roaming\PrusaSlicer where you will see the ini files. Delete PrusaSlicer\Prusaslicer.ini 


1. Open a command prompt

2. Enter  AppData\Roaming\PrusaSlicer followed by the return key

3. Type Dir *.ini followed by the return key and you should see a couple of ini files

4. Type Del Prusaslicer.ini  followed by the return key and the file should be deleted

5. Click on X to close the command prompt and try the slider again.




Posted : 06/02/2021 4:36 am

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