NullReferenceException with older RustNot An Issue

Hello, I have a Rust v2220 server, and I have tried to use the plugin set prepared by you for creating events in Rust but I have some problems, for example:
1- Try to create an event with GunGame, everything starts fine, but after one player is matched by another, the matched player can't do anything inside the event (it's as if it didn't exist) and the server shows the following errors:
I hope you can help me, regards.

Failed to run a 1.00 timer in 'GunGame v0.4.22' (NullReferenceException: )
at (wrapper managed-to-native) UnityEngine.Component.GetComponentFastPath(UnityEngine.Component,System.Type,intptr)
at UnityEngine.Component.GetComponent[T] () [0x00021] in <0618f269b594493b97c56ba78f03373a>:0
at Oxide.Plugins.GunGame+<GiveGear>c__AnonStorey2.<>m__0 () [0x00000] in <7e6d59699e8d4db691dad83491d7cb29>:0
b/s out
at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ac41dd3599754d448b8c218b34645820>:0
[PlayerRanks] Player Ranks Local Database Was Saved.
Failed to run a 120.00 timer in 'GunGame v0.4.22' (NullReferenceException: )
at (wrapper managed-to-native) UnityEngine.Component.GetComponentFastPath(UnityEngine.Component,System.Type,intptr)
at UnityEngine.Component.GetComponent[T] () [0x00021] in <0618f269b594493b97c56ba78f03373a>:0
at Oxide.Plugins.GunGame.MacheteNotification (BasePlayer player) [0x0002c] in <7e6d59699e8d4db691dad83491d7cb29>:0
ut
at Oxide.Plugins.GunGame+<MacheteNotification>c__AnonStorey1.<>m__0 () [0x00000] in <7e6d59699e8d4db691dad83491d7cb29>:0
at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ac41dd3599754d448b8c218b34645820>:0
Sorry, older and unofficial game versions are not supported. Please update.
Locked automatically