Help! "No Access" for Non-Member Registered Users

I find the “Membership” system quite complicated to manage so I simply set-up my Classifieds with the following:

1. All users are required to register (but no need for membership selection)

2. Every listing they post, they will select “Free” or “Paid”

My problem is, after they post, this message appear

No Access, Sorry your membership level prevents access to this listing.

and they cannot edit their post.

Any help?