Nikon coolpix l3 lens error Can you help me to troubleshoot this problem. Thank you

LENS ERROR simply means there is a problem with the lens.
If the description is more detailed it would help.
Type of camera in the post always will help.
When the error started is helpful as well as how long you had the camera, as how it has been treated, did it ever get dropped, or had an impact of any kind?

Remember that digital cameras are very fragile, and should always be treated as if they are eggs, so to speak. Also the LCD is very easy to break if thrown into a purse, or some other carry bag. The camera should always be used with the wrist strap around the wrist, and put back into a padded case when done.
Lens errors can result in a number of problems.
The lens may be out of sync, or the guides internally could be off track.
Some of the internal parts, such as the gears could be broken (you will usually notice a grinding or other noise if this is the case).
There could be some dirt or sand in the track, thus causing the lens to stop or jam.
If the lens is cocked to one side, that is usually the result of an impact when the lens is extended. Sometimes this can be fixed by gently pushing the opposite direction when starting the camera.

Take care,