Error with s-function when simulink system is called within a matlab function

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I face a problem regarding the simulation of a Simulink file. In my main file I am calling a function and within this function I am using the sim command

sim('Simulink_file_name', 'SrcWorkspace', 'current');

to run the simulation. For the simulink to have access in the caller workspace, I have to use the SrcWorkspace argument. However, the simulink file seems to be unable to read the s-functions which are needed. The error that I get is the following.

Error using 'Simulink_file_name'. Error in 'Block_name' while executing C MEX S-function 'S-function name', (mdlStart), at time 0.0. Caused by:

Error using Simulink_file_name

Could not get the variable 1.

Of course, when I try to simulate the system in my main loop instead of a function, everything works properly.

Has anybody experienced a similar problem or knows how I can circumvent it?