I found some inaccuracies in the documents (HTML Client SDK Overview v 6 0.pdf).
Section "Testing your plugin with the local HTML client"
Now (on Linux vCSA):
/etc/lib/vmware/vsphereclient/vsphereclient/compatibilitymatrix.xml
Should be (on Linux vCSA)(.../lib/... should be removed):
/etc/vmware/vsphereclient/vsphereclient/compatibilitymatrix.xml
Thank you!