That should be something the library documentation (or source code?) tells you.
Also, this is funny - when I searched for the library, the only mention I could find was a Xojo forum post from 2021. Guess who wrote it?
And guess what the solution was?
Make sure that the person working on your dylib hasn’t done the same thing, so you’re not passing a pointer to a pointer into the grabber.
See Help calling a function from dylib - #19 by anon20074439
