FEAT: DO now support error! values as argument.
FEAT: DO now support error! values as argument.

DO is used this way to fire an error from user code.

NikolayShubenkovProgSchool/red,red-eco/red,rheber/red,rheber/red,vehar/red,red-eco/red,vehar/red,NikolayShubenkovProgSchool/red