Error: A foreground process is already running

I found the error but I have no clue how to avoid it. The error is in Assistant. When the RPA named “ZK uvid” is clicked in the right pane I get the error. When clicked in the left pane it runs normal. All other RPA are running normal! So only this one named “ZK uvid” gives the error.

Anybody have a clue how to solve this error?