Means your reverse sensor has failed. You can replace it or bypass it. Most do the bypass. Once bypassed though, the reverse light will never come on again. But you will also have full power in reverse at all times. No limiters.
You can also put a switch on the bypass circuit wiring. This way you can turn on the bypass when you like.
You can also put a switch on the bypass circuit wiring. This way you can turn on the bypass when you like.