@thor: I have found a similar thread at https://tech.knime.org/forum/knime-users/evaluation-of-java-snippet-failed-for-row-row-0-orgdom4jdocumentexception
What makes it similar? My InvocationTargetException is caused by
Caused by: java.lang.ClassCastException: org.openxmlformats.schemas.spreadsheetml.x2006.main.impl.SstDocumentImpl cannot be cast to org.openxmlformats.schemas.spreadsheetml.x2006.main.SstDocument
So what do I have to do in order to read .xlsx files?
I tried adding both the manual jars and the poi provided by KNIME. The same error appears. Do you have any suggestions?