Could not complete this operation, An unknown error has occured

[jasinj33239899]

Hello,

I have a problem, I can not save for web (GIF) on windwos 10 Photoshop cc 2017 this message shown me:

Could not complete this operation, An unknown error has occured

Thank you

[c.pfaffenbichler · Accepted solution]

What have you done for trouble-shooting so far?

Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:

https://helpx.adobe.com/photoshop/kb/basic-trouble-shooting-steps.html

Is there anything noteworthy about the image/animation, is it »very big«, »very long«, …?