Error Message: 'Failed to instantiate the frame window'

Problem

The following error message appears when starting CODESYS:

or

This error indicates that one or more needed .opt files are corrupted.
These opt files are imported when CODESYS is opened, and are related to saved user and/or project settings.

Solution

First attempt:

• Restart CODESYS. CODESYS is now started with the default settings.

Second attempt (also, if this is mentioned in the message):

• Delete the following files:

  • C:\ProgramData\CODESYS*.opt

  • C:\Users\\AppData\Roaming\CODESYS\CODESYS.opt

• Restart CODESYS. CODESYS is now started with the default settings.

If this still doesn't solve the problem, please contact CODESYS Support: support@codesys.com