Alpine HeadUnit "DC ERROR" help

[Maseq]

Hey there guys, bought an alpine head unit brand new a while ago, after installing it everything was fine for 2 months. This is when the error message "DC Error" was visible constantly on display.

I've checked all of the wiring as people have told be that there bust be a wire that's grounding out to the car chassis. But everything seems fine. Is there anything else I can do to get rid of the error?

Any help is much appreciated! Thank You.