[photoshop cc] Impossible d'effectuer cette opération en raison d'une erreur programme

@Gaël Illustrations  Please Consider including the following in your question:

• Adobe product and version number
• Operating system and version number
• The full text of any error message (s)
• What you were doing when the problem occurred
• Screenshots of the problem
• Computer hardware, such as CPU; GPU; the amount of RAM; etc

Maybe you can post your Photoshop system info. In Photoshop goto Help > System Info and hit the copy button. Then paste the entire informations into this thread

Thanks. The above info will help to solve your problem.

J'ai le même problème chez moi. Rien ne marche plus...
Obligé d'utiliser la version Beta de Photoshop

Thank you. The first solution works for now. I'll come back if it persists and none of the other solution work. 

Please try to disable the option to "Use Graphics Procesor" from Photoshop by going to Preferences, then Performance. Once done, quit & relaunch Photoshop to check if that helps.

If it helps, you can check out the steps suggested here:  https://helpx.adobe.com/photoshop/kb/troubleshoot-gpu-graphics-card.html

If the issue persists, you can try to reset the preferences of Photoshop using the steps described here:

Preferences in Photoshop (adobe.com)

Please backup your settings before resetting the preferences. You can check:

Migrate presets, actions, and settings (adobe.com)

Another try is to enable the Older GPU Mode option in "Preferences" > "Technology Previews" > "Use Older GPU Mode (pre 2016)". Then goto "Preferences" > "Technology Previews" and enable "Disable Native Canvas". Restart Photoshop.

If this all doesn't help, we need more informations aubout your system. Maybe you can post your Photoshop system info. In Photoshop goto Help > System Info and hit the copy button. Then paste the entire informations into this thread.