niFgen Export Signal

I am using niFgen Export Signal with LabVIEW 8.6F. I am trying to set up a software trigger and route it to PFI0 on a PXI-5421 AWG, however, I keep getting the error "Invalid value for signal name" when using any of the Defined Values as found in the niFgen Export Signal help menu under "Signal", specifically "NIFGEN_VAL_START_TRIGGER". I cannot find any niFGEN VI examples that contain the niFgen Export Signal VI. Might anyone have any exporting trigger example VIs that I could take a look at? Is there a primer somewhere on trigger set-up? Thanks.