Hi Roland,
sorry for the late reply - some other projects got in the way.
I conducted the exchange of the server executor files, but am now getting the error message from this forum post:
EDIT:
I found the issue why the error message appeared.
My knime.ini file from the 3.7 executor still referenced an old JRE path:
plugins/org.knime.binary.jre.linux.x86_64_1.8.0.152-01/jre/bin
I had to change that to the new one from the 4.0 executor:
plugins/org.knime.binary.jre.linux.x86_64_1.8.0.202-b08/jre/bin
@Roland: Thanks for your help, issue is resolved.
BR Alex