Here's the right way to fix the Photoshop could not complete your request because of a program error that you may see on your computer.

Why does my Photoshop keep saying Program error? Errors like Photoshop could not complete your request because of a program error can occur due to multiple reasons.

All a "scratch disk error" means is that you're running out of storage. And that space is necessary to complete the task you're currently trying to perform.

If one of your apps, such as Photoshop, has stopped working since you installed Mojave, try this method to get it working again ...