How to modify the issue that different guilds cannot form teams and only the national system can form teams? thanks #28

/Server/src/engine/net/client/handlers/GroupInviteHandler.java
// Group is new, create it.

    if (group == null)
        group = GroupInviteHandler.createGroup(source, origin);

    if (group == null)
        return false;

    if (!group.isGroupLead(source)) // person doing invite must be group lead>
        return true;

Excuse me, is this statement added here?
if(!source.guild.nation.equals(target.guild.nation)
return false;