I don't use Carbonite, so I cannot help you with your actual problem.
However, it would probably be a help if you included a little more information, such as what version of Carbonite you have installed, what client you are using (Classic Era, SOM, TBC or Retail), and eventually what LUA error you get (if any).
You can turn ON errors by running this script
/console scriptErrors 1
And this to turn them off again:
/console scriptErrors 0
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