I faced the same issue when I copied the buddypress.css from buddypress/bp-templates/bp-legacy/css to mythemes/buddypress/css
Here is the code below I used to get rid of this…
function your_theme_cover_image_css( $settings = array() ) {
/**
* If you are using a child theme, use bp-child-css
* as the theme handel
*/
$theme_handle = 'bp-parent-css';
$settings['theme_handle'] = $theme_handle;
/**
* Then you'll probably also need to use your own callback function
* @see the previous snippet
*/
$settings['callback'] = 'bp_legacy_theme_cover_image';
return $settings;
}
add_filter( 'bp_before_xprofile_cover_image_settings_parse_args', 'your_theme_cover_image_css', 10, 1 );
add_filter( 'bp_before_groups_cover_image_settings_parse_args', 'your_theme_cover_image_css', 10, 1 );