'BetterChat v5.2.1' is using deprecated hook 'OnPlayerChat', which will stop working on Wednesday, 01 January 2020. Please ask the author to update to 'OnPlayerChat(BasePlayer player, string message, Chat.ChatChannel channel)'

Same here.

(19:39:37) | 'BetterChat v5.2.1' is using deprecated hook 'OnPlayerChat', which will stop working on Wednesday, 01 January 2020. Please ask the author to update to 'OnPlayerChat(BasePlayer player, string message, Chat.ChatChannel channel)'

This has been resolved in the latest Oxide update.

perfect thx