Unfortunately, Blizzard have added in some new models in the recent patch that are not included with MazzleUI. This will result in the 'No camera found' message occurring occasionally, but it is only very occasionally. If you're getting the message on virtually everything you click, I'd guess you're missing an interface update somewhere.
Firstly, I'd suggest you check out Detard's excellent 2.3 Add-on pack to make sure the more important mods are functioning correctly;
Detard's 2.3 Thread
Detard's 2.3 Download
Once you've done that, download the following models file (kindly supplied by Detritis).
Detritis's Model File Download
Once downloaded, extract the file to the ...\Interface\AddOns\Mazzifier directory, overwriting the existing Mazz3D_DBF.lua file. Run WoW, load the Mazzifier, tick "Add-On Settings", continue to the "Add-On Settings" tab, scroll down and ensure "Mazzlefizz's 3D Characters" is ticked and then Mazzify.
Finally, comment out the final 2 lines of the ...\mazzleui\mazzleui_models.lua file, so the code looks like this;
Code:
-- PlaySoundFile("Sound\\Character\\Human\\MaleNPC\\HumanPesantMale\\HumanPesantMaleWoundB.wav");
-- self:Print("No camera found. Report this mob to Mazzlefizz!")
If you follow the above steps, you should have all of the currently available models working correctly, and the error message temporarily removed for any that don't have a camera available. Hope this helps.