[Correlli]

You don't have 'i' defined.

pawn Code:

public Score()
{
SetPlayerScore(i,1);
}

If you want to set score for everyone then you should do like this:

pawn Code:

public Score()
{
for(new i = 0; i < MAX_PLAYERS, i++)
{
SetPlayerScore(i,1);
}
}

Or for one player:

pawn Code:

public Score(playerid)
{
SetPlayerScore(playerid,1);
}

Edit: Weirdosport was faster