B4R Question Could not find part of path ...

Hello

I finally found some time to test @kolbe his library: https://www.b4x.com/android/forum/threads/rpn532-rfid-reader-writer.105561/

However, when just pasting the lib in my additional lib folder and copy pasting sample code, I'm getting following error:

B4R Version: 2.51
Parsing code. (0.01s)
Compiling code. (0.03s)
Building project Error
Could not find part of path <extra_libs_path\rpn532 .

Click to expand...

Changing the path does not make any difference. Any ideas?
Thanks