How much does it cost to fix nikon d90 common error?

It's a very common error with Nikon D90 cameras ''Folder contains no images". I tried all the solutions available online. So I'm only interested in one answer. How much would I pay if I took to the professionals as camera is out of warranty. Anyone had to pay for this problem?

Have you tried formatting the card- and if that doesn't work- try replacing it with a new one?

If those suggestions do not work, the first thing I would do is to email or call Nikon's customer support.

The only common error I know is a F-- error with a g-type lens, this is most likely card related

That doesn't sound like a D90 error, more of a card problem, or your computer's trying to read nef files (Nikon's raw format) with no raw decoder.