In order to fix this accessory may not be supported on iphone, get your accessory cleaned then plug your charger back then as you see the error message put your finger on the dismiss button and then pull out the charger with pressure on your screen plug back the charger then turn off your device while the charger is still plugged in and then get it restarted after that get your iPhone connected to the charging cable then as the error message appears then dismiss it or ignore it after that turn on the airplane mode then turn it off and then switch it on again after a minute. If you still need any sort of help for the fix then connect with the experts at Apple contact number UK.