How can I hide the error message "There was an error while copying to the Clipboard. An internal error occurred."
Edit --> Preferences --> Security (Enhanced) --> Uncheck "Enable protected mode at startup" (or "Enable enhanced security).
It worked for me, but looks like some people still have problems.
From https://forums.adobe.com/message/2005962 by "paulh"
For Windows 10, right-click Start, go to System, then Clipboard and turn Clipboard history off. That worked for me.