Hi,
I'm having a quick look through the error codes and FX_CALLER_ERROR is 0x20. 0x11 means FX_MEDIA_NOT_OPEN. If it's NetX return value that you're seeing, then NX_CALLER_ERROR is indeed 0x11, but this only applies to the functions with nx_ prefix. Can you build from source and determine what is the output from the function tx_thread_identify inside _fxe_media_open (as you step into fx_media_open)? What kind of media are you trying to open?