Thank you very much for your help. I have just finished installing LabVIEW, LV FPGA and NI-RIO again and everything works. Most probably there were some issues with my former installation of NI-RIO and the version on the remote device got corrupted in a way or was not updated properly. With the new installation I could load the new version of NI-RIO on my device and it finally runs.
Thanks again for you help Christian and JMota,
Regards, Frank