Error on every video

[PoloCodesStuff]

I can't watch/download any video because of an error and i don't know why :(

[pheonix2005-star]

youtube has updated so that is what costing issues

[J013k]

Errors usually have codes.
Is it C1-2784-1?
If yes then:
#111.

[PoloCodesStuff]

Errors usually have codes. Is it C1-2784-1? If yes then: #111.

Yes, they always have the same error