用COMTOOL的build时，老出现这个错误，请问我该怎么做啊？谢谢！！！
??? Error using ==> copyfile


Error in ==> C:\toolbox\combuilder\combuilder\comtool.m (build)
On line 771  ==> copyfile(['src\' dllname],'distrib');

??? Error while evaluating javax.swing.JMenuItem ActionPerformedCallback.