Hi!
Did you check manually if the executable is at the place it is trying to look for?
Call string was: ‘/Applications/KNIME-4.1.0.app/Contents/Eclipse/plugins/de.openms.macosx.x86_64_2.6.0.202004161737/payload/bin/OMSSA/omssacl
If it is there, can you try to open a command line there and execute it to see if it is executable?