You should have selected the CCD file error

Why am I getting this pop up message when I am trying to burn an image to my DVD with ImgBurn software application?
There is a huge file more than 450 MB which I am trying to burn on my DVD. I click on “Write image File to disc” and then click on OK.
The moment this is done I get the below pop up message.
ImgBurn
You should have selected the CCD file and not this one. I’ll do it for you automatically this time, but don’t do it again!
Then I click on Ok and continue the process, which burns the data on to my DVD. But why does this error message pop up? Is it because the file size is huge?
