Matlab to run SImulink with Compiled code Error

Hello, I have a script from which I call a Simulink MOdel. Inside this Simulink model I have some blocks that were programmed and compiled with VisualC++. When I run directly the Simulink model I have no problems, but when trying to run it from the script

options = simset('SrcWorkspace','current');
sim('mymodel.mdl',[],options)

I get the following error at the end of the simulation:

??? Error due to multiple causes.

Caused by:
    Could not get structure variable.

      Error in 'mymodel/S-Function_dirdynared' while executing C MEX S-function
      'functionmine', (mdlTerminate), at time 10. MATLAB error message:
      Could not get structure variable.

Any idea what is going on? Thank you very much in advance

[Virginia]

I think I figured out the error source. Inside my VisualC++ code I have a statement that tries to store data in a structure storeData(Data,"data_loc"); And thi is giving me the error of Could not get structure variable But still I do not really know why or how to solve it

[Kaustubha Govind]

Does it look for a certain variable in the workspace? If so, where have you defined the variable - is it in the base workspace, or the workspace of the function that you are calling the SIM command from?