Failed to Verify Referrer

I’m continuing to get this error and it’s become extremely annoying. I’ve been using this plugin since 2012 and this problem only started happening in the last two days.

I have also been using WP Super Cache on my since 2012. There has been nothing that has changed on my website.

I followed your blog post and it does NOT help me. So please don’t reference.

Here are all the things I have done:
1. Disabled all plugins & load them back one by one.
2. Upgraded WP
3. Downgraded WP
4. Emptied and deleted all cached files
5. Receiving same error on development site too.

Website address: bizpacreview.com

Polls in the left hand sidebar and also in the posts on the website.

https://www.ads-software.com/plugins/wp-polls/