View Compilation Error

0_0_23483511_18024.cpp: In function 'void FFT(CMP*, int)':
0_0_23483511_18024.cpp:32:55: error: lvalue required as left operand of assignment
     if(dl == -1) for(int i=0;i<len;i++) now[i].real() /= len;
                                                       ^