I cannot get the optical flow to work,

I cannot see the drivers in Device Manager, have been through all the forums and cannot figure out my problem. I have Python 2.7 but cannot upload to my APM. Have been working this for days now. When I upload thru Arduino, I get "expected constructor, destructor, or type conversion before '(' token" and have no idea of what that means?

Then down below, I get the folowing:

AP_OpticalFlow_test.cpp: In function 'void loop()': AP_OpticalFlow_test.pde:-1: error: 'flowSensor' was not declared in this scope

 Can anyone please help, thanks............Don

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