i have Oxide Update 2.0.4889 but i know he have new oxide update one i will do this update to soon as possible

OnTeamKick' on plugin 'Rustcord v2.5.2' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.Rustcord.OnTeamKick (RelationshipManager+PlayerTeam team, BasePlayer player, System.UInt64 target) [0x000bb] in <0eaf5e87a30d422197fa80f597ca180a>:0
at Oxide.Plugins.Rustcord.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00dcc] in <0eaf5e87a30d422197fa80f597ca180a>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <80b90e8213db44b29ec2d4111764172c>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <ec05e0208c9149bba43236ca58fea105>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <ec05e0208c9149bba43236ca58fea105>:0

That's an NRE, not a crash. Just ignore it.

ok thanks !!!