C:\Users\mace\Desktop\Code Related Folders\Untitled Trucking Server\gamemodes\MTruck.pwn(1878) : error 029: invalid expression, assumed zero

stock ChooseMissionRewardOffJobNumber(playerid)
{
	new string[144], string2[144], reward;
	switch(aTMInfo[][mission_number]) // This is the issue.
	{
		case 0:
		{
			reward = randomEx(950, 1250);
			GivePlayerMoney(playerid, reward);
			format(string, sizeof(string), "%s: Thanks for moving that freight. Good job.", aTMInfo[0][mission_actor_name], reward);
			format(string2, sizeof(string2), "%s(%d) Has moved some frieght for Steve earning a grand total of $%d.", PlayerName(playerid), playerid, reward);
			SendMessage(playerid, -1, string);
			SendMessageToAll(-1, string2);
		}
		case 1:
		{
			reward = randomEx(1000, 1500);
			GivePlayerMoney(playerid, reward);
			format(string, sizeof(string), "%s: You finished just in time. Good job!", aTMInfo[0][mission_actor_name], reward);
			format(string2, sizeof(string2), "%s(%d) has finished working for Ian in Doherty earning a cool $%d.", PlayerName(playerid), playerid, reward);
			SendMessage(playerid, -1, string);
			SendMessageToAll(-1, string2);
		}
	}
	return 1;
}