[Scenario]

You just had bad indentation.

pawn Код:

#include <a_samp>

#define FILTERSCRIPT

#define COLOR_CRIMSON 0xDC143CAA

//Checkpoints
new EnterHouse, LeaveHouse;


public OnFilterScriptInit()
{
    print("\n-----------------------------------------");
    print(" Checkpoints By Larsey123");
    print("-------------------------------------------\n");

    //Checkpoints
    EnterHouse = CreatePickup(1273, 23, 966.84710693359,2133.0017089844,10.8203125);
    LeaveHouse = CreatePickup(1273, 23, 965.08758544922,-53.164505004883,1001.1245727539);

    return 1;
}

public OnPlayerPickUpPickup(playerid, pickupid)
{
    if(pickupid == EnterHouse)
    {
        if(IsPlayerAdmin(playerid)==1)
        {
            SetPlayerPos(playerid,963.37561035156,-53.307209014893,1001.124572);
            SetPlayerInterior(playerid,  3 );
            SendClientMessage(playerid,COLOR_CRIMSON,"Welcome to the Admin House!");
        }
    }
    else SendClientMessage(playerid,COLOR_CRIMSON,"You connot enter, Just for admins!");
    else if(pickupid == LeaveHouse)
    {
        SetPlayerPos(playerid,969.80432128906,2133.1311035156,10.8203);
        SetPlayerInterior(playerid,  0 );
        SendClientMessage(playerid,COLOR_CRIMSON,"You have left the Admin House!");
    }
    return 0;
}