[Astralis]

You didn't gave us lines so we can't exactly know which line is which, should of given like:

pawn Код:

new playerid; // error line 3373

Anyways, on top of the script do:

pawn Код:

new Team_1[MAX_PLAYERS];

Since it aint defined, and if it will say the same error for Team_2 and others just do like with Team_1.

Loose indentation warning means that your code is not aligned.

Change

pawn Код:

public OnPlayerTakeDamage(playerid, damagedid, Float: amount, weaponid)

to

pawn Код:

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid)

When player chooses a team, you should also always do

pawn Код:

Team_1[playerid]=1;

and all the other teams like Team_2 and so on.

I guess you should try to understand something here instead of copy pasting and trying to make it work since it won't help you to learn anything.