[Plugin: All-in-One Calendar by Time.ly] PHP file warnings

I’m getting the following ‘Illegal sting offset’ warnings when using the time.ly calendar plug-in. There are no updates for WordPress, my WP theme or for the plug-in itself… Any thoughts?? Here is the URL to the page this is happening on: https://e3detroit.com/calendar/

Here are the warnings:
Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 395

Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 396

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 398

Warning: Illegal string offset ‘singular’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘plural’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 395

Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 396

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 398

Warning: Illegal string offset ‘singular’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘plural’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 395

Warning: Illegal string offset ‘domain’ in /home3/draff1/public_html/wp-includes/l10n.php on line 396

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 398

Warning: Illegal string offset ‘singular’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘plural’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Warning: Illegal string offset ‘context’ in /home3/draff1/public_html/wp-includes/l10n.php on line 399

Thank you!!