Error processing checkout. Please try again.

Hello! after the last update of our theme, wordpress and woocommerce an error shows up when you want to do the check out.

this is my system report. Any help? thanks in advance

### WordPress Environment ###

Home URL: http://hardcraftco.com
Site URL: http://hardcraftco.com
WC Version: 3.4.3
Log Directory Writable: ✔
WP Version: 4.9.6
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ✔
Language: en_US
External object cache: –

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.36 - We recommend using PHP version 7.2 or above for greater performance and security. How to update your PHP version
PHP Post Max Size: 128 MB
PHP Time Limit: 120
PHP Max Input Vars: 1000
cURL Version: 7.54.0
OpenSSL/1.0.2k

SUHOSIN Installed: –
MySQL Version: 10.2.15-MariaDB
Max Upload Size: 128 MB
Default Timezone is UTC: ✔
fsockopen/cURL: ✔
SoapClient: ✔
DOMDocument: ✔
GZip: ✔
Multibyte String: ✔
Remote Post: ✔
Remote Get: ✔

### Database ###

WC Database Version: 3.4.3
WC Database Prefix: wp_
MaxMind GeoIP Database: ✔
Total Database Size: 1.94MB
Database Data Size: 1.58MB
Database Index Size: 0.36MB
wp_woocommerce_sessions: Data: 0.05MB + Index: 0.00MB
wp_woocommerce_api_keys: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_attribute_taxonomies: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_downloadable_product_permissions: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_order_items: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_order_itemmeta: Data: 0.01MB + Index: 0.01MB
wp_woocommerce_tax_rates: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_tax_rate_locations: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_shipping_zones: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_shipping_zone_locations: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_shipping_zone_methods: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_payment_tokens: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_payment_tokenmeta: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_log: Data: 0.00MB + Index: 0.00MB
wp_commentmeta: Data: 0.00MB + Index: 0.00MB
wp_comments: Data: 0.00MB + Index: 0.01MB
wp_duplicator_packages: Data: 0.00MB + Index: 0.00MB
wp_fmepco_poptions_table: Data: 0.00MB + Index: 0.00MB
wp_fmepco_rowoption_table: Data: 0.00MB + Index: 0.00MB
wp_fmepco_temp_table: Data: 0.00MB + Index: 0.00MB
wp_links: Data: 0.00MB + Index: 0.00MB
wp_options: Data: 0.68MB + Index: 0.05MB
wp_postmeta: Data: 0.57MB + Index: 0.10MB
wp_posts: Data: 0.20MB + Index: 0.05MB
wp_termmeta: Data: 0.00MB + Index: 0.01MB
wp_terms: Data: 0.00MB + Index: 0.01MB
wp_term_relationships: Data: 0.00MB + Index: 0.01MB
wp_term_taxonomy: Data: 0.00MB + Index: 0.01MB
wp_usermeta: Data: 0.03MB + Index: 0.02MB
wp_users: Data: 0.00MB + Index: 0.01MB
wp_wc_download_log: Data: 0.02MB + Index: 0.03MB
wp_wc_webhooks: Data: 0.02MB + Index: 0.02MB
wp_yoast_seo_links: Data: 0.00MB + Index: 0.00MB
wp_yoast_seo_meta: Data: 0.00MB + Index: 0.00MB

### Post Type Counts ###

attachment: 176
customize_changeset: 17
flamingo_contact: 6
intergeo: 1
nav_menu_item: 14
page: 15
post: 4
product: 17
product_variation: 23
revision: 59
shop_coupon: 1
shop_order: 4
wpcf7_contact_form: 1

### Security ###

Secure connection (HTTPS): ❌
					Your store is not using HTTPS. Learn more about HTTPS and SSL Certificates.
Hide errors from visitors: ✔

### Active Plugins (22) ###

Akismet Anti-Spam: by Automattic – 4.0.8
Contact Form 7 Captcha: by 247wd – 0.0.2
Contact Form 7: by Takayuki Miyoshi – 5.0.2
Cookie Notice: by dFactory – 1.2.44
Disable User Registration: by Andrei Gheorghiu – 1.0.1
Duplicator: by Snap Creek – 1.2.40
Flamingo: by Takayuki Miyoshi – 1.8
Product Custom Options(Free): by FME Addons – 1.0.1
Holded for WooCommerce: by  – 1.0 – Not tested with the active version of WooCommerce
Instagram Feed: by Smash Balloon – 1.9
Intergeo - Google Maps Plugin - Lite: by Themeisle – 2.2.3
MBE e-Link: by MBE Worldwide S.p.A. – 1.1.0
Musli Social Links: by ziemekpr0 – 1.0
Regenerate Thumbnails: by Alex Mills (Viper007Bond) – 3.0.2
WooCommerce Table Rate Shipping by Mangohour: by mangohour – 1.2.1 – Not tested with the active version of WooCommerce
Woo Additional Terms: by MyPreview – 1.1.0
WooCommerce PayPal Express Checkout Gateway: by WooCommerce – 1.6.0
WooCommerce: by Automattic – 3.4.3
WooSwipe: by Website Design – 1.1.6.6
Yoast SEO: by Team Yoast – 7.7.1
WP Super Cache: by Automattic – 1.6.2
YITH WooCommerce Uploads: by YITHEMES – 1.2.1

### Settings ###

API Enabled: ✔
Force SSL: –
Currency: EUR (€)
Currency Position: right
Thousand Separator: .
Decimal Separator: ,
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

### WC Pages ###

Shop base: #12 - /shop/
Cart: #13 - /cart/
Checkout: #14 - /checkout/
My account: #15 - /my-account/
Terms and conditions: #244 - /terms-conditions/

### Theme ###

Name: Shop Isle
Version: 1.1.43 – 1.1.44 is available
Author URL: https://themeisle.com
Child Theme: ❌ – If you are modifying WooCommerce on a parent theme that you did not build personally we recommend using a child theme. See: How to create a child theme
WooCommerce Support: ✔

### Templates ###

Overrides: –

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