The bot used to play naxxramas just fine if i manually started the game, after the GvG rewrite it just complains with:
Full support for playing though Naxx, and tutorial games is a planned feature, but was a low priority feature in terms of getting a working build out after GvG. As a result, any client states that were not fully supported were coded to stop the bot and show an error so any issues related to the new system can be looked into. If you want to manually start your Naxx games, and then let the bot play though the match, support can be added for that again 'soon'. Support for configuring Naxx matches to play and starting games will take some time, but is something that is going to be done.
Any updates on when Naxx will get supported, I really don't want to hand cram through that whole place to get the cards...