why did i get this message ?

In cases where the opponent has insufficient material to mate (lone King, King + Knight, King + Bishop, King + 2 Knights) a draw will be automatically declared where there is a time-out.

...or in this case, because white would have lost on time, but black didn't have any checkmating material, it was a draw. if black would have had a pawn, white would have lost!

Right   thanks all