Critical error while placing order

fatal-errors-2020-08-20-a0edfcda66c9c4f9fde9e7f47ac2dd9f.log

2020-08-20T19:03:51+00:00 CRITICAL Uncaught Error: Call to undefined function mcrypt_module_open() in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php:361
Stack trace:
#0 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(273): encrypt(‘merchant_id=728…’, ’49B7C22CBCC53CA…’)
#1 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(123): WC_Mrova_Ccave->generate_ccavenue_form(‘5135_20082051’)
#2 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(287): WC_Mrova_Ccave->receipt_page(5135)
#3 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array)
#4 /home1/holmarc/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home1/holmarc/public_html/wp-content/plugins/woocommerce/templates/checkout/order-receipt.php(44): do_action(‘woocommerce_rec…’, 5135)
#6 /home1/holmarc/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(344): include(‘/ in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php on line 361

2020-08-20T19:04:22+00:00 CRITICAL Uncaught Error: Call to undefined function mcrypt_module_open() in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php:361
Stack trace:
#0 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(273): encrypt(‘merchant_id=728…’, ’49B7C22CBCC53CA…’)
#1 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(123): WC_Mrova_Ccave->generate_ccavenue_form(‘5135_20082022’)
#2 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(287): WC_Mrova_Ccave->receipt_page(5135)
#3 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array)
#4 /home1/holmarc/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home1/holmarc/public_html/wp-content/plugins/woocommerce/templates/checkout/order-receipt.php(44): do_action(‘woocommerce_rec…’, 5135)
#6 /home1/holmarc/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(344): include(‘/ in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php on line 361

2020-08-20T19:09:21+00:00 CRITICAL Uncaught Error: Call to undefined function mcrypt_module_open() in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php:361
Stack trace:
#0 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(273): encrypt(‘merchant_id=728…’, ’49B7C22CBCC53CA…’)
#1 /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php(123): WC_Mrova_Ccave->generate_ccavenue_form(‘5138_20082021’)
#2 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(287): WC_Mrova_Ccave->receipt_page(5138)
#3 /home1/holmarc/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array)
#4 /home1/holmarc/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home1/holmarc/public_html/wp-content/plugins/woocommerce/templates/checkout/order-receipt.php(44): do_action(‘woocommerce_rec…’, 5138)
#6 /home1/holmarc/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(344): include(‘/ in /home1/holmarc/public_html/wp-content/plugins/ccavenue-payment-gateway-woocommerce/index.php on line 361

———————————————————————————

Site Health Status
The site health check shows critical information about your WordPress configuration and items that require your attention.

1 critical issue

An active PHP session was detected
Performance
A PHP session was created by a session_start() function call. This interferes with REST API and loopback requests. The session should be closed by session_write_close() before making any HTTP requests.

The page I need help with: [log in to see the link]