Within blueocean 1.2.0 I opened the branches tab for a multibranch pipeline job and hit the edit symbol. The following message appears.

Unfortantly, the message doesn't tell me anything. I'm pretty confident that my Jenkinsfile is in declarative syntax even with the script {} in use, but I can be wrong.

Anyways, I want to fix this problem. Can somebody please have a look on my Jenkinsfile to clarify if I made a mistake?

I replaced our commands and comments because of company compliance rules... But the structure is the same.

Thanks for your help