new createdPickups = 0;
new pickUp[10];

public OnPlayerDeath(playerid, killerid, reason)
{
   new Float:pos[3];

   GetPlayerPos(playerid, pos[0], pos[1], pos[2]);

   pickUp[createdPickups] = CreatePickup(1240, 1, pos[0], pos[1], pos[2], GetPlayerVirtualWorld(playerid));

   createdPickups ++;
  
   return 1;
}

public OnPlayerPickUpPickup(playerid, pickupid)
{
   switch( pickupid )
       case pickUp:
          new ranHel = random(30), new Float:Healll;
              GetPlayerHealth(playerid, Healll);
                  SetPlayerHealth( playerid, Healll + ranHel );
   return 1;

(2446) : error 008: must be a constant expression; assumed zero
(2448) : error 001: expected token: "-identifier-", but found "new"
(2449) : error 017: undefined symbol "Healll"
(2450) : error 017: undefined symbol "Healll"

		case pickUp:
     {
			new ranHel = random(30), new Float:Healll;
   			GetPlayerHealth(playerid, Healll);
			SetPlayerHealth( playerid, Healll + ranHel );

case pickUp:
     {
            new ranHel = random(30), Float:Healll;
            GetPlayerHealth(playerid, Healll);
            SetPlayerHealth( playerid, Healll + ranHel );

// global variable:
new
    bool: RandomPickup_HealthArmour[ MAX_PLAYERS char ], // false = health and true = armour (saving space)
    RandomPickup
;

// When a player dies (get the position and set the as the coordinates of the pickup):
new
    r_health_armour = random( 2 )
;
if( !r_health_armour )
{
    RandomPickup_HealthArmour{ playerid } = false; // Health
    // Create health pickupid:
    RandomPickup = CreatePickup( ... ); // EDIT THE LINE
}
else
{
    RandomPickup_HealthArmour{ playerid } = true; // Armour
    // Create armour pickupid:
    RandomPickup = CreatePickup( ... ); // EDIT THE LINE
}

// When a player pickups the pickup:
if( pickupid == RandomPickup )
{
    new
        Float: amount
    ;
    if( !RandomPickup_HealthArmour{ playerid } ) // health pickupid
    {
        GetPlayerHealth( playerid, amount );
        SetPlayerHealth( playerid, amount + RandomEx( 5, 30 ) );
    }
    else
    {
        GetPlayerArmour( playerid, amount );
        SetPlayerArmour( playerid, amount + RandomEx( 5, 30 ) );
    }
    DestroyPickup( RandomPickup );
}

// the random function for 5-30 percent
stock RandomEx( min, max ) //By ******
{
    return random( max - min ) + min;
}