Why are you using an old copy of WordPress? Were you aware that your site is currently running a very real risk of being hacked? You need to upgrade WordPress asap.
Apologies I misunderstood the version question – thought it meant of the plugin I’m using. The WordPress version I am using is 3.6. I plan on upgrading to 3.7 shortly but want to get it running first. Thanks. Any ideas about the original question?
The current version of the plugin may only be supported with the current version of WordPress. Upgrade WordPress first and, then if you still have problem, check out the plugin’s FAQ.
Just updated everything – WordPress and plugins. I am still getting the same error. Any other ideas?