请问 在用matlab 运行SDM模型是，报错

info.lflag=0; % required for exact results
info.model=1;
info.fe=0;
results=sar_panel_FE(y,[x wx],W,T,info);
vnames=strvcat('lngdp','lnb','lni','lnfdi','lnm','lnr','lnt','lnc','W*lnb','W*lni','W*lnfdi','W*lnm','W*lnr','W*lnt','W*lnc');
% Print out coefficient estimates
prt_spnew(results,vnames,1);
% Print out effects estimates
spat_model=1;
direct_indirect_effects_estimates(results,W,spat_model);
panel_effects_sdm(results,vnames,W);

??? Undefined function or method 'mtimes' for input arguments of type 'struct'.总是出现这个报错，请问怎么解决？