vc 调用matlab 编译无错误，运行出错

CXX0030: 错误: 无法计算表达式的值
strcpy(ttt,"tf=gongshengzhen1('');");
strcat(ttt,address1);
strcat(ttt,"');");
engEvalString(ep,ttt);engEvalString(ep,"test=tf;");
//engEvalString(ep,"test=[1 1 t];;");
engEvalString(ep,"test=[3 2 0 1 2 2];;");
engEvalString(ep,"load D:\\资料\\实验\\wangmodelfourfeature.mat;");
engEvalString(ep,"test_label=[1];");
engEvalString(ep,"[ans,percent]=svmpredict(test_label,test,model);");
engEvalString(ep,"class=ans;");
//mxArray *label=engGetVariable(ep,"class");
ep1=engGetVariable(ep,"class");
ep2=mxGetPr(ep1);
m_label=*ep2;用engEvalString(ep,"test=[3 2 0 1 2 2];;");不出现错误
用engEvalString(ep,"test=tf;");
出现CXX0030: 错误: 无法计算表达式的值
位置在ep1=engGetVariable(ep,"class");
ep2=mxGetPr(ep1);

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