Unable to edit Function Library

Hi all,

I am unable to edit a function library I created. I always get a NullPointerException:

There is no syntax error in the included functions. The Library is activated, but it is also not found by the runtime. When I send a test message I get an error that the used functions were not found.

I have already tried to create another function library. I am able to create and activate it, but get the same error when I try to edit it.

I am working on a Java single-stack.

Any suggestions?