Small error in your almost perfect wonderful plugin

I did have an issue with writing a New Message and Reply message in that where the commands bold, italic, strikethrough, code, etc. where not showing up… I have attached a link to a photo i took with my mouse hovering over the error.

Photo example of problem

this is why I gave it 3 stars instead of 5 and I will gladly change it immediately if you can help me in fixing it. Thank you!

https://wordpress.org/plugins/cartpauj-pm/