Thx for this post it really helped me out.
I just opened the .lua file with wordpad (as suggested by someone) that is already on my computer. Went to edit > replace > Find What : ChatFrameEditBox > Replace with : ChatFrame1EditBox, and then clicc replace all.
Someone else had posted to make the change with all caps, but when I did that I was still getting the error; I took out all caps except for the first letter of each word as above and it worked. No more errors!! YAY
