Not 100% sure but my best guess is:

Your client code is calling a function that doesn't exist on the DX object you're using... in other worlds the DX you used to compile is incompatable with the DX that is installed on computer the program is running...

It could also be a problem with incorrect headers or manual function prototypes. As the message describes, it most often happens with function pointers, because calling conventions are assumed at run-time rather than checked at compile-time when using function pointers. It can also occur when jumping into random code as a result of a bad function pointer (although it is more likely that other errors would occur first).

Background details on calling conventions.