saber 仿真逆变器出现错误，请求帮忙

saber 仿真逆变器出现下列错误，请朋友帮忙解决，谢谢！

line 94 of DA75.sin near "_422 m:0 ": *** ERROR "MAST_UNDEF_ARG" ***

Undefined argument "pwl".

line 95 of DA75.sin near "22 m:0 r.": syntax error

Template DA75

*** ERROR "MAST_EXITING" *** Exiting due to previous errors. See file TI07A.out.

TI07A: total CPU execution time= 0.562 sec.