does anybody know the error code SU-35642-0 for the PS4?

I recently decided to play on my PS3, but now wanted to switch back to my PS4, but at first it came up with a 'serious error' came up, but I managed to fix that but now my PS4 is not letting me login to my account or anything cause of the error code SU-35642-0.. so does anybody know what that means?