Hi the problom i have is that the lens wont retract fully and the screen is displaying lens error it a coolpix nikon camera

The lens has become jammed with dirt / grit between the moving parts of the lens barrel and the body of the camera. This is a frequent problem - and is not covered by defect warranty. The dirt / grit will have to come out before the lens can fully extend or retract. The camera senses the lens position at start up and if the lens is not found in or fails to get to the start position within a predetermined amount of time, the camera fails with the error.

Since these are delicate devices, disassembly is discouraged. Many times, the camera will cost more to repair than it is worth, especially if it is more than a couple of years old. Call Nikon for your repair options, or deal with a local repair shop directly.

Good luck!