KeyNotFoundException at OnBetterChatFixed
Failed to call hook 'OnBetterChat' on plugin 'BetterChatMentions v1.2.1' (KeyNotFoundException: The given key was not present in the dictionary.)
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <1f0c1ef1ad524c38bbc5536809c46b48>:0
at Oxide.Plugins.BetterChatMentions.OnBetterChat (System.Collections.Generic.Dictionary`2[TKey,TValue] data) [0x00023] in <93084677192f49d7afac5e792e479a2c>:0
at Oxide.Plugins.BetterChatMentions.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0005b] in <93084677192f49d7afac5e792e479a2c>: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
Open the plugin.cs file and locate line 82
Which is
Change "Text" to "Message" that's it done! (This is because of the new API changes with BetterChat image attached)

Thank me later :D