If you are unable to check into a venue. The first item you'll want to confirm is if you have your GPS settings or Location Services enabled for Rockbot. This should be located in your Settings on your Android or iOS device. You'll need to have them turned on in order to check in to the location.
If you are still having trouble, email email@example.com with the type of device you are using and your DJ username so we can look into this further with you. In addition, if you could open up maps, drop a pin and send a screenshot to firstname.lastname@example.org.