[KnooL]

pawn Код:

if(IsPlayerInRangeOfPoint(i, 10.0, -302.628,1507.450,76.070) && OpenGate[i] == 0);

must be

pawn Код:

if(IsPlayerInRangeOfPoint(i, 10.0, -302.628,1507.450,76.070) && OpenGate[i] == 0) {

Edit: On top on your script:

pawn Код:

new OpenGate[MAX_PLAYERS];