How to fix the ezSQL_mysql requires mySQLi Lib to be compiled error
Fatal Error: ezSQL_mysql requires mySQLi Lib to be compiled and or linked in to the PHP engine
Login to cPanel and choose Select PHP version.
Tick the mysqli option and press save.
Reload your FeedSync page and the error should disappear. If the error persists you will need to contact your hosting provider to compile the library into php for you.