ESellerate

If you're getting "eSellerate Engine Error" or "an internal error has occurred in the engine", the first thing you should try is to reinstall the eSellerate Engine.

If that doesn't work, try these things:

for Macintosh

Clean up the eSellerate Resources with RegFix, then just try again.
If that doesn't work, try this, then this.

If things are still going wrong even after all of the above, run System Check, and email me the results ASAP, we'll get it figured out!

Windows

not sure yet