DAQmx Timing ( Sample clock ) error 200077

Hi,

I continue to get this error when trying to setup a counter.  I'm using the USB 6000 board.  I'm trying to count the time between edges using the counter on channel 0.  I have a finite number of samples I'd like to collect.  I keep getting this error no matter why typ of clock setting I try here.  Any help woudl be apprecitated.  Sample snip of my code is here below too.