What does this accessory may not be supported mean?

Related questions

1. Why does it say plugged in but not charging?
2. How do I know if my dead iPhone is charging?
3. Is it my battery or alternator?
4. How do you fix a iPhone that wont turn on or charge?
5. Does my iPhone qualify for a new battery?
6. Why is my tablet not charging when plugged in?
7. How long does it take to charge a dead iPhone?
8. Is my laptop battery dead?
9. Why did my iPhone go black?
10. Why isn't my iPhone charging when plugged in?

Tags

1. #appear
2. #charging
3. #device
4. #message
5. #airplane
6. #iphone
7. #connect
8. #dismiss
9. #cable
10. #error
11. #ignore