Embeding YouTube vids in Wordpress causes validation errors

I noticed that YouTube videos when embedded are trowing validation errors caused by use of sign used in URL.

I tried to use widget with same result. I also used several cleaner codes found on internet.

Does anyone have a solution for this one? It would be highly appreciated.

because wordpress uses XML for parsing etc. and "&" is an illegal character.

Simple solution; write it as "&" and it should be fine.