RT digital input-output problems when using myRIO FPGA Vision

[terhesati]

Hi all!
I'm making a custom FPGA/RT project using myRIO at my university. I'd like to make a turret/sentry camera that can track an object with predefined color.
The turret has two DC motors and a webcam controlled by the myRIO.The webcam's continous stream of images are processed with an FPGA program using the Vision Express VI. I modified an existing Vision FPGA example. The FPGA and real time part of the image processing seems to work well, but when I try to open a DIO line on the RT VI (to controll the motors) everything goes wrong.
If the I start the DIO line first (on the host) and then the FPGA, the FPGA program doesn't execute. If I start the FPGA first and wait for the system ready input the DIO doesn't work and give the following error:
LabVIEW could not perform the operation because an FPGA VI reference to another VI is currently open.

Both the motor controlling and image processing part work individually but not together. I even tried to turn on the MyRIO's LEDs testing the DIO lines when running the FPGA program, but it dindn't work either. I got the same error.

I attached my cutsom FPGA project.

Thanks: Attila
(Sorry for my bad english.)