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Problem using counter input while using digitial output

Hi there.

 

I am using a USB-6251 and want to measure a frequency using one counter while generating a digital wavefor on Port0.

 

Each task exectutes nicely on it's own, but when I try to run both tasks together, I get the following error message:

NationalInstruments.DAQmx.DaqException

Message: Specified route cannot be satisfied, because it requires resources that are currently in use by another route.

 

Property: NationalInstruments.DAQmx.CIChannel.CounterTimebaseActiveEdge

Source Device: Dev1

Source Terminal: 80MHzTimebase

Destination Device: Dev1

Destination Terminal: Ctr0Source

 

Required Resources in Use by

Task Name: TriggeredPinChange-Output

Source Device: Dev1

Source Terminal: 20MHzTimebase

Destination Device: Dev1

Destination Terminal: do/SampleClock

 

What am I doing wrong?

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