Why am I getting this error for Autoblog: WP Http error

I am getting a WP HTTP Error.
Here are some of the log exports. Any ideas???

{"log_id":"1","feed_id":"4","cron_id":"1439210363","log_at":"1439224763","log_type":"210","log_info":"a:1:{i:0;s:44:\"WP HTTP Error: A valid URL was not provided.\";}"}]}

Also, can Autoblog import posts from external blogs and a specific category from the external blog? Our setup is we have several blogs feeding a single blog. We only want posts from the feeder blogs to come from a specific category.