FCPX version 10.4 will not export any timeline

Hello. I really hope you can help me..
Every time I try to export a masterfile or any other option - in any project - it shuts down and comes with the message:
" The share operation has failed. CompressorKit.ErrorDomain error-1 ".
I have tried to delete the render files etc. but nothing helps.

I am running FCPX ver 10.4 on OS X ver 10.12.6
Hardware: iMac, Retina 5K, 27-inch, late 2014

I have enough disk space. More than 20 percent