Invalid MEX-file

[fra1800]

Hi all, when I run the code on matlab it gives me the following error:
Invalid MEX-file
'/Users/francescatancredi/Documents/MATLAB/TRENTOOL3-master/tstool_functions/mex_mac/mex64/nn_prepare.mexmaci64':
dlopen(/Users/francescatancredi/Documents/MATLAB/TRENTOOL3-master/tstool_functions/mex_mac/mex64/nn_prepare.mexmaci64,
0x0006): Library not loaded: @loader_path/libmat.dylib
Referenced from: <04E03B10-32AF-4711-B7B8-E3EBD7B64DC1>
/Users/francescatancredi/Documents/MATLAB/TRENTOOL3-master/tstool_functions/mex_mac/mex64/nn_prepare.mexmaci64
Reason: tried:
'/Users/francescatancredi/Documents/MATLAB/TRENTOOL3-master/tstool_functions/mex_mac/mex64/libmat.dylib'
(no such file), '/usr/local/lib/libmat.dylib' (no such file), '/usr/lib/libmat.dylib' (no
such file, not in dyld cache)

Could anyone help me solve the problem?