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Signal Conditioning

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Problem with trigger edge specifyins : error 89133

Hello,
 
I'm working with a USB-6259 counters with Labwindows/CVI 8.0. I have a problem when specifying the edge type for an Digital Trigger.
If I specify an Rising edge trigger, it works fine. If I specify a Falling edge trigger, I have got this error :
 
Specified inversion cannot be
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