Resource(s) L Unit Write Port on side B in conflict in E1 phase

在用dsplib写FFT程序，用C6713软件仿真时* Runtime error at PC = 000003d4      Resource(s) L Unit Write Port on side B in conflict in E1 phase. Ref SPRU189F Sec 3.7, Sec 4.5, Sec 7.2 ，菜鸟求大神指导