Error on Checkout Page

[saeides]

I have Woocommerce subscription plugin on my website. In the checkout page, when the billing form is filled and the credit card is entered I press pay and it turns to green check mark but after few seconds gives the error HTTP2.0 500.

I contacted the server and run the debug mode found out the error is:

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

After updating PHP Version and do all advises ended up seeing this error on latest PHP Error log:

PHP Fatal error:  Call to a member function process_email_html() on null in /home/mealogy7/public_html/wp-content/themes/kleo-child/functions.php on line 143

I really need your help!

 

[saeides]

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