Could not complete the Layer command because of a program error

In a first step you should try to reset the preferences of Photoshop using the steps described here:

https://helpx.adobe.com/photoshop/using/preferences.html#reset-preferences

It's recommended to backup the settings before resetting the preferences. Please see here:

https://helpx.adobe.com/photoshop/using/preferences.html#backup-photoshop-preferences

If this doesn't help check your system if it's up-to-date. Do you have installed all recent updates and patches for the operating system and the device drivers, especially the graphic driver. If you have a NVidia graphic card installed, make sure that you are using the recent Studio version of the driver, not the Game Ready version.

Please also provide a copy of your 'System Info'. This can be get from the Photoshop menu item Help > System Info. There's a copy button in the System Info dialog. Press this button and paste the info into your next forum post.

There are a few solutions I'd recommend trying first:

1. Restart Photoshop
2. Update Photoshop (if it isn't the latest version)
3. Reset Preferences https://community.adobe.com/t5/photoshop-ecosystem-discussions/resetting-photoshop/m-p/14523539