The error seems to be
Caused by: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://api.hub.knime.com/nodes/org.knime.sap.theobald.node.v2.SAPTheobaldReader2NodeFactory?details=full: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
PKIX path building failed
errors can be resolved following this thread. If I see that correctly, than the first option is following the linked video and the other one might be faster with altering your knime.ini
file:
Does that work?