在做stata 多时点did 安慰剂检验：permute Audit beta=_b[Audit] se=_se[Audit] df=e(df_r) ,reps(500) seed(500) saving ("C
> :\Users\lhjdn\Desktop\ssT\anweiji.dta"):xtreg ESG2 Audit ROA Cashflow  Indep Occupy L
> ev Board i.year ,fe r\

然后一直出现Permutations (500): option \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
x10option \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
x20option \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
x30option \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
xoption \ not allowed
请问大家，这该怎么解决啊，谢谢谢谢