iacos;
I have found that you can get that same error when there is a syntax error in the function you are calling. Check that you wrote the name of the function correctly. The following vi is excellent to find out all the functions exported by a dll:
Display Exported Functions in DLLAs a final option, try copying the dll in the Windows/System directory.
Let us know.
Regards;
Enrique
www.vartortech.com