Hood open warning will appear almost the entire time i am driving but the hood is not open

The hood position sensor is probably defective which sometimes happens from age or just from opening and closing the hood, especially if the hood is slammed too hard. No matter what, it's not a difficult fix. The switch is located on the passenger side (left) latch and can be replaced in about 15 minutes or so once you have the part. Here is an excellent video on replacing it:
Replacing the LR3 and Range Rover Sport Hood Latch
Parts are readily available at Atlantic British and they are a great outfit to work with. You can, of course, get the part special order from your LR dealer.

Cheers.