I got this error
Failed to call hook 'SignMapChatCommand' on plugin 'SignMap v1.0.0' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.SignMap.GetMaps () [0x00000] in <d2e6a020db794ed2897955aa6fb1606c>:0
at Oxide.Plugins.SignMap.HandleGen (BasePlayer player, System.String[] args) [0x002da] in <d2e6a020db794ed2897955aa6fb1606c>:0
at Oxide.Plugins.SignMap.SignMapChatCommand (BasePlayer player, System.String cmd, System.String[] args) [0x000dd] in <d2e6a020db794ed2897955aa6fb1606c>:0
at Oxide.Plugins.SignMap.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0023a] in <d2e6a020db794ed2897955aa6fb1606c>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <3e46d2a997e94a3cb08cf065508cd483>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <1fe782f4b27a43ae85d29ebb2d56c007>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <1fe782f4b27a43ae85d29ebb2d56c007>:0
(06:15:12) | Failed to call hook 'SignMapChatCommand' on plugin 'SignMap v1.0.0' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.SignMap.GetMaps () [0x00000] in <d2e6a020db794ed2897955aa6fb1606c>:0