What is the meaning of: Error using verify_eml​_resolved_​functions (line 9) Unexpected Standard exception from MEX file. What() is:fl:file​system:Sys​temError?

I am using Matlab R2018a and using a Simulink slx block as the top model that calls 2 complicated sub models (reference models). I am running this block iteratively through a Matlab script. On 1 of my computers this runs perfectly fine and I get NO errors. However, I use exactly the same files/ blocks on another comuter running same version of Matlab and I keep getting the following errors intermittently. Sometime the block runs without any errors and most of the time gives the following errors:

• * *Error using verify_eml_resolved_functions (line 9)Unexpected Standard exception from MEX file.What() is:fl:filesystem:SystemError..

Error in sync_eml_resolved_functions (line 79) failed = sort(verify_eml_resolved_functions(mainMachineId,targetId,resolvedFunctions , block));

Error in sync_target (line 105) sync_eml_resolved_functions(thisMachine,mainMachine,thisTarget);

Error in autobuild_kernel>compute_checksums (line 262) sync_target(targetId, targetId,machineId);

Error in autobuild_kernel>autobuild_local (line 164) [checksumChanged,linkMachineChecksumChanged,jitIncCodegenInfo] = compute_checksums(machineId,machineName,linkMachines,targetId,targetName,rebuildAllFlag);

Error in autobuild_kernel (line 62) status = autobuild_local(machineId,targetName,rebuildAllFlag,buildType,chartId,chartHandle);

Error in autobuild_driver (line 118) status = autobuild_kernel(machineId,'sfun','build','no','no');

Error in slsf (line 117) autobuild_driver('simbuild',machModelH,'sfun');

Error in script (line number) sim('<name>.slx')***

I have tried uninstalling and reinstalling Matlab from scratch on the computer where the issue occurs, but it did not help. Any help would be appreciated.