From the appearance of that error dialog it doesn't seem to belong to any error generated by the FlexMotion driver. It looks a lot more like a user defined error dialog that might have been made by whoever coded your application. I would ask them, or , if you prefer, you could send us your code by contacting an applications engineer at 1-866-ASK-MYNI or posting it here. We will gladly ty to reproduce the problem and let you know where the error is coming from.