Hi,
Somewhere is an error, please deactivate all plugin except buddypress, visual composer,k-elements and revolution slider and also deactivate child theme and let me know if it works.
Also you can enable wp debug to find out what causes this
Follow these steps to enable wp debug:
- Connect to your server by FTP
- Look in root directory of your WordPress install and open wp-config.php
- Search for define( 'WP_DEBUG', false ); and change FALSE value to TRUE
define( 'WP_DEBUG', true );
- After this line add this:
define( 'WP_DEBUG_LOG', true );
WP_DEBUG_LOG is a companion to WP_DEBUG that causes all errors to also be saved to a debug.log log file inside the /wp-content/ directory. This is useful if you want to review all notices later or need to view notices generated off-screen (e.g. during an AJAX request or wp-cron run).
Repeat the described actions and then check the debug.log file and let me know what error appears.
After you have disabled the plugins try to see if the error persists.
Cheers