(20:32:34) | Couldn't find prefab "assets/bundled/prefabs/static/chair.invisible.static.prefab"

(20:32:34) | Failed to call hook 'chatBuildCopter' on plugin 'Gyrocopter v1.2.11' (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.Gyrocopter.AddCopter (BasePlayer player, UnityEngine.Vector3 location) [0x0004c] in <37eeba6976414df2977966d79858d2e2>:0

at Oxide.Plugins.Gyrocopter.chatBuildCopter (BasePlayer player, System.String command, System.String[] args) [0x00074] in <37eeba6976414df2977966d79858d2e2>:0

at Oxide.Plugins.Gyrocopter.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x004b0] in <37eeba6976414df2977966d79858d2e2>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <09575a60985045248bcb43b20faeeb99>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0

since the rustupdate I have this error message

same here

The issue is with the prefab
"assets/bundled/prefabs/static/chair.invisible.static.prefab"

This was removed in the latest update on accident. Should be another update to fix that soon.