[Plugin: WP Web Scraper] Problem with version 2.7

I upgraded to the latest version of this plugin and received an error after upgrading. I tried deactivating/deleting/reactivating and receive this message:

The plugin generated 498 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

The scraper still appears to be working, but I’m not sure if it’s causing other issues on the site. Is this a known issue with version 2.7?