The first error is OK. It means the domain is added to a list of sites we don't want to see on Buxr. Some of them (but not all) are listed on this wiki page: http://www.buxr.com/wiki/fake_freebie_sites
Unfortunately I can't do anything about the second error ("Unable to read from the URL"). If you see it then I suggest you try submitting that URL again later (the problem has intermittent nature).
Sometimes its the way you copy the URL because its happened to me also. Try to copy the URL into a word doc so you can see what it looks like to make sure its all there and remove your email address if necessary before pasting, that always works for me.
Here is a work around for you, psplove, if the link still doesn't work after you wait. Save that coupon image on your computer and submit this coupon as a file upload. You can then post the original link in the comments to your deal.
Thank You Yan. I uploaded the Image. Some time I get rejected by upload the Image. That's why I try to post with the link then getting Unable to read from the URL.