Missing Method Exception: getDeviceFromRincon() in Sonos Advanced Player

[TheMegamind]

When executing any group command on any player that "isGroupedAndNotCoordinator," the following error occurs (with varying line numbers and method names):

groovy.lang.MissingMethodException: No signature of method: user_driver_dwinks_Sonos_Advanced_Player_831.getDeviceFromRincon() is applicable for argument types: (java.lang.String) values: [RINCON_XXXXXXXXXXXX] Possible solutions: getDNIFromRincon(java.lang.String) on line 523 (method muteGroup)