Hi @pzkor -
It looks like KNIME is not able to find your Tableau libraries for whatever reason.
One thing to note is that when you set up Tableau in your KNIME preferences, the string that you need to add to your path changes depending on whether you select the TDE or Hyper option:
On my system, the strings are
C:\Program Files\KNIME\plugins\org.knime.ext.tableau.tde.bin.win32.x86_64_9.3.1.v201903041623\Tableau-SDK\bin
and
C:\Program Files\KNIME\plugins\org.knime.ext.tableau.hyper.bin.win32.x86_64_2018.2.2.v201903041623\extractapi-x64-2018-2-3\bin
Are you sure that you updated your path with the correct string?
If so, can you provide a bit more information about your system (OS, KNIME version, and so forth)? We’ll get it figured out.