An error of type E_ERROR was found in line 42

Hi,
I am getting an error message from my website that shows the error log and it shows that your site has some error. Please check the error message below.

An error of type E_ERROR was found in line 42 of the file …./ public_html / wp-content / plugins / official-facebook-pixel / vendor / facebook / php-business-sdk / src / FacebookAds / Object / ServerSide / Normalizer .php causes. Error message: Uncaught TypeError: strlen (): Argument # 1 ($ string) must be of type string, array given in …./ public_html / wp-content / plugins / official-facebook-pixel / vendor / facebook / php- business-sdk / src / FacebookAds / Object / ServerSide / Normalizer.php: 42

Please let me know why this is happening and how we can fix it.