The error message is pretty straightforward: LabVIEW can not find the DLL you are trying to call (mclmcrrt72.dll) at the location you specified in the Call Library Function (CLF) Node setup. Are you sure that the DLL exists at the path you entered in "Library Name or Path" field? The best way to check this is to copy the path from the CLF Node setup and to paste it into the Windows Explorer address field. If there is no DLL at that location, then you need to move it there or chage the path to the correct one.
If the DLL is located in the same path as the one specified in the CLF Node, then perhaps you could post an simplified example so that we could try to reproduce the behavior. What version of LabVIEW are you using and what's the story on the DLL?
Kind Regards,
E. Sulzer
Applications Engineer
National Instruments
