When you receive an error message when trying to generate PIN codes, you may have generated the maximum number of PIN codes available. In order to generate more PINs, you will have to reset your PIN codes. 

Instructions to reset PIN codes are available here.

Do note that any previously generated PIN codes will become invalid, but the Master PIN code will remain the same.

* For users who have not generated the maximum number of PIN codes, you may have to do a re-pairing of the lock to the newest version of the app. This may be due to either 1. the lock was paired to older version of the app (and thus unable to generate PINs in the new app), or 2. the server was unresponsive although pairing was marked as successful