I've seen a number of similar posts this year for this exact issue. When I try to register my CEH 9 book via a valid access code, I receive a page with broken code/markup the ends with the following blob of text:
Fatal error: Call to a member function getMessage() on a non-object in /home/sybextestbanks/public_html/application/views/scripts/error/error.phtml on line 9
I have tried the registration in multiple browsers on multiple computers to no avail. The other forum posts appear to have a representative named Tom replying via private message to the posters with the resolution.