You can update the rsobj.php file to tun on the debug option in order to get the actual error message.
In this case the error is: "Column 'address' cannot be null"
This is because your database is set up to not allow null values for the address column in your database, and in the insert server behavior you have the "value if blank" setting for that column set to "null".
You can either update the database to allow null in that column, or update the server behavior to insert "blank" instead of "null" when that insert value is blank for that column.