Profibus with p&F coupler

[Vishnu.R]

HI, 

I am using cRIO profibus module to communicate with profibus PA device using pepplers + fuchs coupler. In configurator i am getting this message when i try to download configuration. Also i am not able to add modules as this popup says.

[AD56]

You need to add a module. Right click inside of the white space below the device block. In the area that says slot 1, 2,3 and select add module.