| [Welcomer] ✘ SmoothWineBeats left the server (Disconnected)
(20:57:07) | Failed to call hook 'OnPlayerSleepEnded' on plugin 'Welcomer v1.5.0' (FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.)
at System.Text.StringBuilder.AppendFormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x000ff] in <a8ed250850854b439cedc18931a314fe>:0
at System.String.FormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x00023] in <a8ed250850854b439cedc18931a314fe>:0
at System.String.Format (System.String format, System.Object[] args) [0x00020] in <a8ed250850854b439cedc18931a314fe>:0
at Oxide.Plugins.Welcomer.Lang (System.String key, System.String id, System.Object[] args) [0x0000e] in <373eb90113f747879eda584d15f0d162>:0
at Oxide.Plugins.Welcomer.OnPlayerSleepEnded (BasePlayer player) [0x00028] in <373eb90113f747879eda584d15f0d162>:0
at Oxide.Plugins.Welcomer.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0014e] in <373eb90113f747879eda584d15f0d162>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

See https://umod.org/community/welcomer/10086-formatexception-at-onplayersleepended

So it's the Lang file to it that bothers it? Do I delete all Lang files from the plugin?

The error is coming from that, yes. Did you customize that file at all?

I changed the colors from <color=lime> to hex colors.

Merged post

They work, but the error shows up within the logs of console

Could you provide the full file here please?

{
"Welcome": "<size=17>Welcome to <color=#0099CC>{0}</color></size>\n--------------------------------------------\n<color=#0099CC>•</color> Type <color=#0099CC>/info</color> for all available commands\n<color=#0099CC>•</color> Read the server rules by typing <color=#0099CC>/info</color>\n<color=#0099CC>•</color> Have fun and respect other players",
"Joined": "<color=#37BC61>✔</color> {0} <color=#37BC61>joined the server</color> from <color=#37BC61>{1}</color>",
"JoinedUnknown": "<color=#37BC61>✔</color> {0} <color=#37BC61>joined the server</color>",
"Left": "<color=#FF4040>✘</color> {0} <color=#FF4040>left the server</color> ({1})"
}

Looks like you have an old version of the lang there, so you'd need to delete it and let it get re-created with the correct format placeholders, else remove {0} from the "Welcome" message.

Failed to call hook 'OnPlayerSleepEnded' on plugin 'Welcomer v1.5.0' (FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.)
  at System.Text.StringBuilder.AppendFormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x000ff] in :0
  at System.String.FormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x00023] in :0
  at System.String.Format (System.String format, System.Object[] args) [0x00020] in :0
  at Oxide.Plugins.Welcomer.Lang (System.String key, System.String id, System.Object[] args) [0x0000e] in <7b593db9b1a542d9827e055584c59baa>:0
  at Oxide.Plugins.Welcomer.OnPlayerSleepEnded (BasePlayer player) [0x00028] in <7b593db9b1a542d9827e055584c59baa>:0
  at Oxide.Plugins.Welcomer.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0014e] in <7b593db9b1a542d9827e055584c59baa>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <33f7c42a56934dae8ec04b11017dce31>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0

Please see the existing thread on this: https://umod.org/community/welcomer/14827-formatexception-in-onplayersleepended

{
  "Welcome": "<size=17>Welcome to the <color=#0099CC>Server</color></size>\n--------------------------------------------\n<color=#0099CC>•</color> Type <color=#0099CC>/info</color> for all available commands\n<color=#0099CC>•</color> Read the server rules by typing <color=#0099CC>/info</color>\n<color=#0099CC>•</color> Have fun and respect other players",
  "Joined": "<color=#37BC61>✔</color> {0} <color=#37BC61>joined the server</color> from <color=#37BC61>{1}</color>",
  "JoinedUnknown": "<color=#37BC61>✔</color> {0} <color=#37BC61>a noob has joined the server</color>",
  "Left": "<color=#FF4040>☒</color> {0} <color=#FF4040>RAGE QUIT!</color> ({1})"
}

You mean removed the {0} from Joined, Joined Unknown and Left?