saber仿真的问题，求解答啊

为什么我的saber仿真总会出现这啊　　　　

The initial point "dc" has been created with a different invocation of Saber.
*** ERROR "CLASS_OPEN_FILE" *** Cannot open the file "boost1d;;Fw.dc.i2".

特别是后面的Fw.dc.i2".  仿真了几个都出现这，什么原因啊