It literally says you don't have the mesitemlink update your emulator.
or replace one of those mesitemlink or itemlink
or alternative.
function script ITEM_INFO {
.@item = getarg(0);
.@itemname$ = getitemname(.@item);
if( .@itemname$ != "null" ) {
.@itemslot = getitemslots(.@item);
if( .@itemslot )
.@itemname$ = sprintf("%s [%d]", .@itemname$, .@itemslot);
}
else
.@itemname$ = "Unknown Item";
if( PACKETVER >= 20150729 )
return sprintf("<ITEM>%s<INFO>%d</INFO></ITEM>", .@itemname$, .@item);
else if( PACKETVER >= 20130130 )
return sprintf("<ITEMLINK>%s<INFO>%d</INFO></ITEMLINK>", .@itemname$, .@item);
else
return .@itemname$;
}