This is one of the common errors on FB Auto Tool and it is an error that has to do with permissions. Posting to Facebook groups require some permissions set by the user posting and the Facebook group admin.
#200 Insufficient permission is caused by one of the following with solutions,
1. The group does not permit Members posting
If the group admin does not permit its group members to post to groups, sending a post with FB Auto Tool to such group will pop up with #200 Insufficient permission error. There is nothing you can do to post to such group.
2. Invalid token. Simply Authenticate other apps to fix.
The last scenario that could lead to you seen the #200 Insufficient permission error is when your app token is expired. When the app token expires, it means the app does not have the required permission to post to Facebook, therefore bring up that error.