WorldGuard API Problem

I do not speak English very well.
Hello, I can not make my plugin works with multiple versions of WolrdGuard
i try to use the next code:

Code:

    public static boolean wgRegionHook(Location location){
        if(Listen.plugin.getServer().getPluginManager().getPlugin("WorldGuard") != null){
            if(Listen.plugin.getServer().getPluginManager().getPlugin("WorldGuard").getDescription().getVersion().contains("6.1") ||
                     Listen.plugin.getServer().getPluginManager().getPlugin("WorldGuard").getDescription().getVersion().contains("6.0")){
                if(WG_6_0(location)){
                    return true;
                } else {
                    return false;
                }
            } else {
                if(WG_5_0(location)){
                    return true;
                } else {
                    return false;
                }
               
               
            }
        } else {
            return true;
        }
    }
   
    public static boolean WG_6_0(Location location){
        /**
        * New [WorldGuard] Versions
        * @6.0 >
        */
        WorldGuardPlugin worldGuard = getWorldGuard();
        com.sk89q.worldedit.Vector pt = com.sk89q.worldguard.bukkit.BukkitUtil.toVector(location);
                
        RegionManager regionManager = worldGuard.getRegionManager(location.getWorld());
        ApplicableRegionSet set = regionManager.getApplicableRegions(pt);
               
        if(set.size() != 0){
            return false;
        } else {
            return true;
        }
    }
   
    public static boolean WG_5_0(Location location){
        /**
         * Old [WorldGuard] Versions
         * @5.0 >
         */
        WorldGuardPlugin WGP = (WorldGuardPlugin)ElementalTrees.plugin.getServer().getPluginManager().getPlugin("WorldGuard");
        if (WGP.getRegionManager(location.getWorld()).getApplicableRegions(location).size() == 0) {
                return true;
        }
        return false;
     }

I need to make my plugin works with all versions of WG. But I can not do it.
It only works with the 5.0 and up. But 6.0 or 6.1 not work with the same method.
Appreciate your help.

 

I don't think it matters if your plugin is not compatible with older versions of a another one, just use the 6.1