VB6 with NI 9237

I am trying to run the VB6 sample program AckIntClk with an NI 9237 Daq module.   I get the following error “Error: -200431 Selected physical channel does not support the measurement type required by the virtual channel you are creating” 

I specify the channel as “cDaq1Mod1/ai0”.  What is the proper syntax or is this program not compatible with this DAQ? 

Any help woudl be appreciated.  Thanks