activate the "One only the list of" the website does not work

Hi.

Real Estate 8.9

Active option only property (listing setup options).

When a user attempts to publish one second listing is not working the website (Different user about the same time). Also with users who have membership to publish multiple properties.

1- In the case of a user (without membership) has posted a listing and is looking to publish the second, the website does not work. (attached image)
¿Real estate should display a message to the user who can not publish more than one listing?

2 – Membership users to publish more than one listing, the website also does not work. (The same mistake as attached image appears.) ..

How do you solve?

best regards, Juan Carlos
Argentina.