Illustrator showing "The operation cannot complete because of an unknown error [!now]" error

"Solution for Adobe Illustrator. Regarding the problem...

"The operation cannot complete because of an unknown error. (Cant)"

The problem is caused by some files in the directories.

"c: \ Program Files \ Common Files \ Adobe \ UXP \"

In Windows 10 (X64)

Rename to "c: \ Program Files \ Common Files \ Adobe \ 00UXP \"

(In this way they are not erased and you can return to them, for if other programs fail)

It contains the routines for the start screen and new documents of the different Abobe programs.

https://helpx.adobe.com/photoshop/kb/troubleshoot-home-screen-issues.html

luck!!! 😉 :)"
Changing UXP to 00UXP worked like a charm!! This actually works for me!!!

For more information, Follow this link: https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/36301807-the-operation-cannot-complete-because-of-an-unknow

You might want to tell us some details, because otherwise we can't solve either.

Which version?

Which system?

Any third party plugins?

A printer?

Any additional input hardware?

All fonts OK?

When was your last computer restart?

What exactly are you doing step by step when this happens?

Did the same ever work correctly?

Does that only happen on specific files?