No worries. These are PHP warnings, not errors. Unlike errors, warnings won’t break your website. They’re just messages aimed at developers to improve their code. Don’t hesitate to reach the Paid Memberships Pro plugin authors to report this issue on their support forums: paidmembershipspro.com/support/
To hide this message, I suggest that you activate error logging on your website. Please keep WP_DEBUG to true and just paste the following code lines in your wp-config.php file, just before the line that says ‘That’s all, stop editing! Happy blogging.’:
// Enable WP_DEBUG mode define( 'WP_DEBUG', true ); // Enable Debug logging to the /wp-content/debug.log file define( 'WP_DEBUG_LOG', true ); // Disable display of errors and warnings define( 'WP_DEBUG_DISPLAY', false ); @ini_set( 'display_errors', 0 );
More on this in the following topic: Debugging in WordPress
You will still be able to consult the warnings and errors triggered by your website but these won’t appear on your pages anymore.
We remain available for all support requests related with the use of your theme.