Call to undefined method APCu_Object_Cache::incr2()

System report code

### WordPress Environment ###

Home URL: https://makestressworkforyou.com
Site URL: https://makestressworkforyou.com
WC Version: 3.0.4
Log Directory Writable: ?
WP Version: 4.7.4
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: en_GB

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.27
PHP Post Max Size: 65 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.45.0
OpenSSL/1.0.1e

SUHOSIN Installed: –
MySQL Version: 5.6.32
Max Upload Size: 64 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.0.4
WC Database Prefix: wp_y8y5fcsr58_
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (18) ###

Antispam Bee: by pluginkollektiv – 2.7.1
Contact Form 7: by Takayuki Miyoshi – 4.7
Genesis Connect for WooCommerce: by StudioPress – 0.9.9
WPBakery Visual Composer: by Michael M - WPBakery.com – 5.1.1.1
PDF Viewer: by Envigeek Web Services – 0.1
PopupAlly: by AmbitionAlly – 2.0.1
Simple Social Icons: by Nathan Rice – 2.0.1
Theme My Login: by Jeff Farthing – 6.4.9
Woo Commmerce Addon for WP Courseware: by Fly Plugins – 1.1
WooCommerce - Active Campaign Integration: by Jason Kadlec: CrazyEffective.com – 1.0.6
WooCommerce PayPal Express Checkout Gateway: by WooCommerce – 1.2.0
WooCommerce Subscriptions: by Prospress Inc. – 2.2.5
WooCommerce: by Automattic – 3.0.4
Wordfence Security: by Wordfence – 6.3.6
Yoast SEO: by Team Yoast – 4.6
WP Courseware: by Fly Plugins – 4.0.9.1
WP Smush: by WPMU DEV – 2.6.3
My Courses Endpoint for Woocommerce: by  – 1.0

### Settings ###

API Enabled: ?
Force SSL: ?
Currency: USD ($)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
subscription (subscription)
variable (variable)
variable subscription (variable-subscription)

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: #1549 - /courses-2/
Basket: #855 - /woocommerce/cart/
Checkout: #858 - /woocommerce/checkout/
My account: #1064 - /woocommerce/account/

### Theme ###

Name: Infinity Pro
Version: 1.1.2
Author URL: https://www.studiopress.com/
Child Theme: ?
Parent Theme Name: Genesis
Parent Theme Version: 2.4.2
Parent Theme Author URL: https://www.studiopress.com/
WooCommerce Support: ?

### Templates ###

Overrides: –

### subscriptions ###

WCS_DEBUG: ? No
Subscriptions Mode: ? Live

Try turning off object caching…

In your hosting account, go to /wp-content/ and rename object-cache.php to object-cache.php-bak

Then test.