Error after last update of plugin

To clearify, the line that the notice refers to with the plugin is the blank line in the middle here:

<div class="cff-row">

                                            <?php _e('Number of columns: '); ?>

and the notice on the frontend refers to this function, specifically the second line pasted here:

function wp_check_invalid_utf8( $string, $strip = false ) {
	$string = (string) $string;

	if ( 0 === strlen( $string ) ) {
		return '';
	}

When I go to the settingstab for the plugin I also see this error:

Notice: Undefined index: error in /home/sunnmaug/public_html/wp-content/plugins/custom-facebook-feed-pro/custom-facebook-feed-admin.php on line 3328

It refers to the second blank line in what I have pasted here:

<label for="cff_show_event_type"><?php _e('Events'); ?></label>

                                <div class="cff-events-only-options cff-more-info">

Hey nekkoy,

I’m not seeing any notices or errors on your site and am seeing the Facebook Feed displaying as expected on this page. Do you still need support or were you able to resolve the problem?

Hope you’re having a good weekend,

John