$ and % throw errors when written

Using the AsyncPlayerChatEvent setFormat() I get a console error whenever I type $ or %.
The output message of when I type $ or % is just unformatted vanilla minecraft chat.
Do I need to escape them in some way?

 

https://forums.bukkit.org/threads/correct-usage-of-asyncplayerchatevent.107127/

 

You need to conform to printf's standards

 

I am using AsyncPlayerChatEvent correctly.

I'll look into this.

Not sure if I'm doing this correctly.
% $ and \ are the characters giving the error as they're used in things such as %s.
Replacing % with %% and \ with \\ seems to fix that for both sending the correct characters (% and \). However, $$ seems to give the exact same error. Am I doing anything wrong or is there an easier way of fixing this?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.