1. Autotune error - This error means that another extension, plugin or template on your site is including Facebook's deprecated all.js Javascript library. That is the 'old' version of the Facebook Javascript API which was discontinued. It's no longer meant to be used and can cause conflicts with some JFBConnect features, as JFBConnect uses the recommended sdk.js library. Some common extensions that included Facebook features are JomSocial, EasySocial, K2. You will need to check your plugins, components and/or template for any Facebook features and try to disable them.
My second issue is, when the emailid which he/she is already registerd with is already logged in browser it throws following error i have attached the image.
Again when i refresh the page it says Emailid already exists.
What version of JFBConnect and Joomla are you using? We added a fix for what sounds like the same issue in a previous release. Could you check the code from
this post
and make sure that the updated code block is present on your site?
-Melissa