MATLAB: Xcrun: error: SDK “macosx10.13.4” cannot be located

cmacMATLAB Compiler SDKxcodexcrun error

I wanna run a C++ file 'mexCoarseGrainGamma.cpp', but there is a error, such like,
>> mex mexCoarseGrainGamma.cpp
Building with 'Xcode Clang++'.
xcrun: error: SDK "macosx10.13.4" cannot be located
xcrun: error: SDK "macosx10.13.4" cannot be located
xcrun: error: SDK "macosx10.13.4" cannot be located
xcrun: error: SDK "macosx10.13.4" cannot be located
xcrun: error: SDK "macosx10.13.4" cannot be located
MEX completed successfully.
Do anyone know what is the problem? And how to fix it? Thank you in advance.

Best Answer

This suggests that the Xcode compiler is not being found. Its probably because of an out of date options file. This might help :
https://www.mathworks.com/help/matlab/matlab_external/sdk-macosx10-8-cannot-be-located-error-message.html?s_tid=answers_rc2-1_p4_MLT
If not, what is the output of running the following command in MATLAB?
mex -v -setup
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