This is a bug and it needs to be addresses correctly to the developer. Access the official website and use the Contact US page. For the menu to become available, a new users needs to be created. Simply click the form and a new window will appear telling you how to create a username. After you're logged in, access the same form again and contact the developer by explaining the error. They will check the time of playing, map, character and any other resources that might lead to this error.