How can I control a dc motor speed using an optical switch?

I am trying to use LabVIEW to create a VI that controls the speed of a DC motor. The system needs to have an user set rpm and the DC motor needs to adjust the duty cycle to obtain the correct rpm dependant on the load. A disk with holes and an optical switch is being used to measure rpm.
The current problem is that I cannot get the rpm based on the optical switch.
Thanks for your help!
Attachments:
Speed reg.vi ‏183 KB

The error for the samples to write does not appear after redoing the vi. Thanks. The controller seems to be working mostly.
However, the issue with the Tone Measurement reading inaccurately at low frequencies still exist. Any ideas?
I have attached the latest vi.
Thanks again!
Attachments:
speed_reg_v2013-05-07.vi ‏183 KB

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How can I control a dc motor speed using an optical switch?

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