Creates a Discography Custom Post Type and allows you to import your albums from Bandcamp.
This is usually because of a timeout issue. Try again later, or if you're importing a lot of albums, try importing them in smaller batches.
Go to Setting->Permalinks and save.
This is most likely a conflict with a plugin or theme. Try switching to a different theme and re-saving the permalinks. If that doesn't fix it, try going through each plugin, deactivating it, re-saving the permalinks, and seeing if that fixes it.