Invoices won’t email from laptop to client

Good Morning Ryan, 

To reply to my private message please select your profile icon on the top right-hand corner of the screen, from here you should see a letter, select this and there should be a message from me. 

I tried to reply to email but it hasn't work it still isn't working and is showing a error now 

Hi Ryan, 

Thank-you for your post, 

I have sent you through a private message for some additional information