I’ve set up the Algolia WordPress plugin on about 40 websites but I’ve had the following issue on 2 of them while trying to index. The error is “An error occurred: Element must be mapped in system”. It occurred for Posts on the one site and Pages on another. The sites are running the latest version of the plugin (2.2.0) and WordPress (4.7.4) and latest version of PHP7 and MariaDB. Any help would be greatly appreciated.