Why NI 9234 create error 20308 when reading pulse measuremen​t of my tachometer​?

Hello,
I am monitoring a machine condition using a triaxial accelerometer and optical tachometer for speed. I have 8 pulses each revolution.
Please find attached my screen shot for the error and the VI. It runs few seconds and stops.
Please try to find what am I doing wrong? 
Many thanks in advance for your help and support.
Attachments:
screen shot error tachometer.png ‏18 KB
Tachometer7-2-3013-2.vi ‏110 KB

Hello Bibb, 
You are receiving this error because you are not crossing the reference levels often enough. The reference levels, described in the help files here, help determine one cycle. If your reference levels are too high and your signal is not crossing them, it will not be able to determine the measurement interval of one complete cycle. Also, if your frequency is too low, it will not cross often enough as well. 
Maggie
National Instruments
Applications Engineer
ni.com/support

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