I had the same problem. For anyone who comes looking, this may help: you need to flush the rewrite rules for permalinks as explained in this thread: https://wordpress.stackexchange.com/questions/202859/custom-post-type-pages-are-not-found
To flush WordPress rewrite rules or permalinks (usually needs to be done manually for new custom post types) from the Dashboard:
1) In the main menu find “Settings > Permalinks”.
2) Scroll down if needed and click “Save Changes”.
3) Rewrite rules and permalinks are flushed.
