FOTRAN编译出错，不知问题出在哪里？ 100

在调用abaqus的vumat子程序时，使用Fortran编译，计算会出现如下错误，求大神解答：

This name has already been used as a dummy function name.[OPPO1] oppo1(k)=dE1 

which is specified as the left side of an assignment statement, is invalid.[OPPO1] oppo1(k)=dE1