Copy the complete OpenCat folder into your main Arduino folder, that helped me!

A big thanks to John: that was easy, everything is working fine now! Best regards from Germany Tom

I'll try that at home and will report the results! Tom

Hi John, thanks for this immediate response! I have located the complete folder opencat (already renamed) far OUTSIDE of the Arduino folder, which is for sure the problem, where should it go exactly to? Thanks again Tom