How to resolve ckecksum error while coding F28335 using simulink Embedded coder?

I have been getting this error frequently ' The model that you are trying to run in External mode does not match the application running on your target. Checksum test (TARGET_DATA_MAP) failed. The host model's structural checksum is [598205352, 2805085873, 1742768243, 2610551041] and the target application's structural checksum is [3244482337, 3985092126, 480157189, 536943710]. Rebuild the model, run it on your target, and start External mode simulation again.'

For some programs, it works fine but for others I have this error. This seems to be a common error as well but there are no good illigible guide. Can someone please suggest a method to resolve this error?