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Well if you get an ID does not exist error, good chance is that your adoptable information is incorrect. This can happen when your adoptables record is only available in prefix_adoptables table but not in prefix_adoptables_conditions table. Or if you have played with phpmyadmin before, the record may exist but share different adoptables ID. In this case, you have to manually edit IDs for each record in prefix_adoptables and prefix_adoptables_conditions so they will match.

If what I said above is too complicated, post two screenshots for your adoptables and adoptables_conditions tables. I will show you what I mean then.