求助：5.06用户修改密码有效期限问题。

我刚接触UINX

在5。06中修改用户密码有效期限，将 days allowed between changes和days until passwd expires 都改为90 ，确认后报错：
Unable to set password expiration for user:  rptc
General failure occurred in processing the request
The password will expire before it can be changed
不知是何原因。请各位大虾帮忙。