error 025: function heading differs from prototype

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid, bodypart)
{
	if(issuerid != INVALID_PLAYER_ID)
    {
		if(amount < 0)
		{
			new string[256],sendername[25];
		    GetPlayerName(issuerid,sendername,sizeof(sendername));
			format(string, sizeof(string), "(N) %s (%d, level %d) can use global kill, damage: %.2f.",sendername,issuerid,PlayerInfo[issuerid][pLevel],amount);
            ABroadCast(COLOR_RED1,string,1);
			return 1;
		}
		if(weaponid == 54 && GetPlayerState(issuerid) != PLAYER_STATE_DRIVER)
		{
		    if(playerdeath[issuerid] == 0)
		    {
				new Float:HP, Float:AP, Float:remainHP;
			 	GetPlayerHealthEx(issuerid,HP);
			 	GetPlayerArmourEx(issuerid,AP);
				if ( AP >= amount )
				{
					SetPlayerArmourEx( issuerid, AP - amount );
					SetPlayerHealthEx( issuerid, HP );
				}
				else if ( AP <= 0 )
				{
					remainHP = HP - amount;
					SetPlayerHealthEx( issuerid, remainHP );
					if ( remainHP <= 0 && playerdeath[issuerid] == 0 )
					{
						OnPlayerDeath( playerid, issuerid, weaponid );
						playerdeath[playerid] = 1;
					}
				}
				else
				{
					remainHP = HP + ( AP - amount );
					SetPlayerArmourEx( issuerid, 0.0 );
					SetPlayerHealthEx( issuerid, remainHP );
					if ( remainHP <= 0 && playerdeath[issuerid] == 0 )
					{
						OnPlayerDeath( playerid, issuerid, weaponid );
						playerdeath[issuerid] = 1;
					}
				}
			}
		}
	}
	if(weaponid == 49 || weaponid == 50 || weaponid == 51 || weaponid == 52 || weaponid == 53 || weaponid == 54 || GetPlayerState(issuerid) == PLAYER_STATE_DRIVER)
	{
	    if(playerdeath[playerid] == 0)
	    {
			new Float:HP, Float:AP, Float:remainHP;
		 	GetPlayerHealthEx(playerid,HP);
		 	GetPlayerArmourEx(playerid,AP);
			if ( AP >= amount )
			{
				SetPlayerArmourEx( playerid, AP - amount );
				SetPlayerHealthEx( playerid, HP );
			}
			else if ( AP <= 0 )
			{
				remainHP = HP - amount;
				SetPlayerHealthEx( playerid, remainHP );
				if ( remainHP <= 0 && playerdeath[playerid] == 0 )
				{
					OnPlayerDeath( playerid, issuerid, weaponid );
					playerdeath[playerid] = 1;
				}
			}
			else
			{
				remainHP = HP + ( AP - amount );
				SetPlayerArmourEx( playerid, 0.0 );
				SetPlayerHealthEx( playerid, remainHP );
				if ( remainHP <= 0 && playerdeath[playerid] == 0 )
				{
					OnPlayerDeath( playerid, issuerid, weaponid );
					playerdeath[playerid] = 1;
				}
			}
		}
	}
	return 1;
}