Bonjour, Lrc et Ps ne détecte plus le ciel.

Google translation: "When I want to select the sky on Lrc or Ps the following message is displayed: no sky detected. Whether on Lrc or Ps."

Most problems with LR's AI commands are caused by older, buggy graphics drivers. Try updating your graphics driver by going directly to the manufacturer's web site:
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-4

If that doesn't help, please copy/paste here the entire contents of the LR menu command Help > System Info -- that will let us see exactly which versions of hardware and software LR thinks you're running.