matlab突然无法打开.m文件 ??? Error using ==> feature Too many input arguments.

运行MATLAB，打开一个程序就出现这样的错误提示：
??? Error using ==> feature
Too many input arguments.

Error in ==> usejava at 47
isok = system_dependent("useJava",feature);

Error in ==> javachk at 44
if ~usejava(requiredLevel)

Error in ==> pathtool at 12

errormsg = javachk("mwt", "The Path tool");

解决方案

命令行输入 >> restoredefaultpath;
                  >> matlabrc;