I have spent a few hours trying find some info about this because i have a 5300 that was dropped and now shows metering error message.
The only thing i found was a video on youtube that takes the rear cover off and plugs in or makes sure the flat wide cable at top of rear of camera which is the metering cable is plugged in correctly. After that he put the battery back in…no more error. I am going to try it. I will repost what happens. I will look for video and post that too.