There's a small error in your code! In the file discord-modmail-master\functions you need to change line 7 & 11 in the file discord-modmail-master\functions\close.js, because when you write interaction.reply it's already been sent, so you need to change it to this: interaction.followUp. The same goes for the discord-modmail-master\functions\reply.js file at line 9 & 12, where you do the same thing.
There's a small error in your code! In the file
discord-modmail-master\functions
you need to change line 7 & 11 in the filediscord-modmail-master\functions\close.js
, because when you writeinteraction.reply
it's already been sent, so you need to change it to this:interaction.followUp
. The same goes for thediscord-modmail-master\functions\reply.js
file at line 9 & 12, where you do the same thing.