Error while running model on raspberry pi hardware

I am using a Raspberrypi camera for taking video input to my image processing circuit. When I tried to simulate the model, I got following error

"The model that you are trying to run in External mode does not match the application running on your target. Checksum test (TARGET_CONNECT) failed. The host model's structural checksum is [3952797520, 3164253609, 4022928347, 1013116400] and the target application's structural checksum is [812222564, 2062717974, 3160967008, 2531862615]. Rebuild the model, run it on your target, and start External mode simulation again. Component: Simulink | Category: Model error Unable to connect to the 'Raspberry Pi' target for 'TRIAL_2'."

Please help me find any solution for this.