Weird writing at the bottom of pages. Messed up theme

[Seth]

It says this at the bottom of my pages:

Warning: Cannot assign an empty string to a string offset in/home/bellebel/public_html/wp-includes/class.wp-scripts.phpon line426

Warning: Cannot assign an empty string to a string offset in/home/bellebel/public_html/wp-includes/class.wp-scripts.phpon line426

fbq('track', 'AddToCart', { value: 3.50, currency: 'USD' });fbq('track', 'InitiateCheckout');fbq('track', 'Purchase', { value: 247.35, currency: 'USD' });

I don't know how to get rid of it please help

 

[Christina]

It says this at the bottom of my pages:

Warning: Cannot assign an empty string to a string offset in/home/bellebel/public_html/wp-includes/class.wp-scripts.phpon line426

Warning: Cannot assign an empty string to a string offset in/home/bellebel/public_html/wp-includes/class.wp-scripts.phpon line426

fbq('track', 'AddToCart', { value: 3.50, currency: 'USD' });fbq('track', 'InitiateCheckout');fbq('track', 'Purchase', { value: 247.35, currency: 'USD' });

I don't know how to get rid of it please help

Please PM me your doman name and WP login details to check the issues. Thank you!