To solve this bug: If you are using the free version of AFC plugin: Accessing to your hosting -> Your WordPress content -> wp-content -> plugins -> advanced-custom-fields -> core -> controllers -> Opening field_group.php -> Go to line 378 -> Replacing the current code
Firstly, Make sure that all Map Settings are provided: Appearance -> Theme Options -> General -> Map Settings. Please pay more attention to mapbox theme, it's Leftleft theme, not the default theme. To get a Map Box theme: Log into your mapbox account: https://www.mapbox.com/
Please log into your hosting address -> Your WordPress folder -> wp-config.php -> Put define('WILOKE_STORE_WITH_DB', true); to the top of this file.