Whenever I turn on my camera it always shows lens error

@ that sounds very much like a stuck lens. Try the suggestion on how to try to fix that on here If unsuccessful, you’ll have to replace the lens.

We do not have a guide for the S3600 on iFixit, but luckily the Coolpix S series is pretty much the same. The S3700 is essentially identical to work on. Just take your time and proceed in an organized fashion. nikon s3700 Lens Replacement - iFixit Repair Guide

While you work on your camera, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!