[Plugin: Section Widget] has_cap was called with an argument that is deprecated since version 2.0!

Hi

I have installed the plugin but I am receiving this error message.

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /mnt/sites/unsaved.stcdev.com/current/wp-includes/functions.php on line 3551

Please can you advise what I need to change.

New to WordPress but I understand a little php!!

Line 3551 points to this function

function _deprecated_argument( $function, $version, $message = null ) {

	do_action( 'deprecated_argument_run', $function, $message, $version );

	// Allow plugin to filter the output error trigger
	if ( WP_DEBUG && apply_filters( 'deprecated_argument_trigger_error', true ) ) {
		if ( ! is_null( $message ) )
			trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s'), $function, $version, $message ) );
		else
			trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
	}
}

Thx

https://www.ads-software.com/extend/plugins/section-widget/