[Konstantinos]

Pre-load the animation before.

pawn Код:

stock PreloadAnimLib(playerid, animlib[])
{
    ApplyAnimation(playerid,animlib,"null",0.0,0,0,0,0,0);
}

And you'll have to set the value of the bar with SetProgressBarValue or SetPlayerProgressBarValue (depends on what version of the include you use).