If I disable the Woocommerce Services plugin, it’s all good so it’s something to do with this plugin.

I’m getting this error when trying to view the shopping cart:

Recoverable fatal error: Object of class WP_Error could not be converted to string in /var/www/dk/wordpress/wp-includes/class-requests.php on line 797

Note: this is a development site.

The error occurs even if I remove the one customized template (related.php) from my theme.

### WordPress Environment ###

Home URL: http://dk.sterndata.com
Site URL: http://dk.sterndata.com
WC Version: 3.5.0
Log Directory Writable: ✔
WP Version: 4.9.8
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: ✔
WP Cron: ✔
Language: en_US
External object cache: –

### Server Environment ###

Server Info: Apache/2.4.35 (IUS) OpenSSL/1.0.2k-fips
PHP Version: 7.2.11
PHP Post Max Size: 16 MB
PHP Time Limit: 30
PHP Max Input Vars: 1800
cURL Version: 7.29.0
NSS/3.34

SUHOSIN Installed: –
MySQL Version: 5.5.5-10.2.18-MariaDB
Max Upload Size: 16 MB
Default Timezone is UTC: ✔
fsockopen/cURL: ✔
SoapClient: ✔
DOMDocument: ✔
GZip: ✔
Multibyte String: ✔
Remote Post: ✔
Remote Get: ✔

### Database ###

WC Database Version: 3.5.0
WC Database Prefix: wp_
MaxMind GeoIP Database: ✔
Total Database Size: 10.29MB
Database Data Size: 8.54MB
Database Index Size: 1.75MB
wp_woocommerce_sessions: Data: 0.02MB + Index: 0.02MB
wp_woocommerce_api_keys: Data: 0.02MB + Index: 0.03MB
wp_woocommerce_attribute_taxonomies: Data: 0.02MB + Index: 0.02MB
wp_woocommerce_downloadable_product_permissions: Data: 0.02MB + Index: 0.05MB
wp_woocommerce_order_items: Data: 0.02MB + Index: 0.02MB
wp_woocommerce_order_itemmeta: Data: 0.02MB + Index: 0.03MB
wp_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB
wp_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.03MB
wp_woocommerce_shipping_zones: Data: 0.02MB + Index: 0.00MB
wp_woocommerce_shipping_zone_locations: Data: 0.02MB + Index: 0.03MB
wp_woocommerce_shipping_zone_methods: Data: 0.02MB + Index: 0.00MB
wp_woocommerce_payment_tokens: Data: 0.02MB + Index: 0.02MB
wp_woocommerce_payment_tokenmeta: Data: 0.02MB + Index: 0.03MB
wp_woocommerce_log: Data: 0.02MB + Index: 0.02MB
wp_commentmeta: Data: 0.02MB + Index: 0.03MB
wp_comments: Data: 0.02MB + Index: 0.09MB
wp_frm_fields: Data: 0.02MB + Index: 0.03MB
wp_frm_forms: Data: 0.02MB + Index: 0.02MB
wp_frm_items: Data: 0.02MB + Index: 0.08MB
wp_frm_item_metas: Data: 0.02MB + Index: 0.03MB
wp_links: Data: 0.02MB + Index: 0.02MB
wp_options: Data: 1.39MB + Index: 0.06MB
wp_postmeta: Data: 1.52MB + Index: 0.19MB
wp_posts: Data: 0.22MB + Index: 0.13MB
wp_termmeta: Data: 0.02MB + Index: 0.03MB
wp_terms: Data: 0.02MB + Index: 0.03MB
wp_term_relationships: Data: 0.02MB + Index: 0.02MB
wp_term_taxonomy: Data: 0.02MB + Index: 0.03MB
wp_usermeta: Data: 0.02MB + Index: 0.03MB
wp_users: Data: 0.02MB + Index: 0.05MB
wp_wc_download_log: Data: 0.02MB + Index: 0.03MB
wp_wc_webhooks: Data: 0.02MB + Index: 0.02MB
wp_wfbadleechers: Data: 0.02MB + Index: 0.00MB
wp_wfblockediplog: Data: 0.02MB + Index: 0.00MB
wp_wfblocks7: Data: 0.02MB + Index: 0.05MB
wp_wfconfig: Data: 0.42MB + Index: 0.00MB
wp_wfcrawlers: Data: 0.02MB + Index: 0.00MB
wp_wffilechanges: Data: 0.02MB + Index: 0.00MB
wp_wffilemods: Data: 1.52MB + Index: 0.00MB
wp_wfhits: Data: 0.13MB + Index: 0.05MB
wp_wfhoover: Data: 0.02MB + Index: 0.02MB
wp_wfissues: Data: 0.36MB + Index: 0.06MB
wp_wfknownfilelist: Data: 1.52MB + Index: 0.00MB
wp_wfleechers: Data: 0.02MB + Index: 0.00MB
wp_wflivetraffichuman: Data: 0.02MB + Index: 0.02MB
wp_wflocs: Data: 0.02MB + Index: 0.00MB
wp_wflogins: Data: 0.02MB + Index: 0.03MB
wp_wfnotifications: Data: 0.02MB + Index: 0.00MB
wp_wfpendingissues: Data: 0.36MB + Index: 0.06MB
wp_wfreversecache: Data: 0.02MB + Index: 0.00MB
wp_wfscanners: Data: 0.02MB + Index: 0.00MB
wp_wfsnipcache: Data: 0.02MB + Index: 0.05MB
wp_wfstatus: Data: 0.14MB + Index: 0.09MB
wp_wftrafficrates: Data: 0.02MB + Index: 0.00MB
wp_wfvulnscanners: Data: 0.02MB + Index: 0.00MB
wp_woof_query_cache: Data: 0.02MB + Index: 0.02MB
wp_yoast_seo_links: Data: 0.02MB + Index: 0.02MB
wp_yoast_seo_meta: Data: 0.02MB + Index: 0.00MB

### Post Type Counts ###

acf-field: 11
acf-field-group: 3
attachment: 436
frm_form_actions: 2
frm_styles: 1
jetpack_migration: 2
nav_menu_item: 4
page: 9
post: 2
product: 29
revision: 6
shop_coupon: 1
shop_order: 1

### Security ###

Secure connection (HTTPS): ❌
					Your store is not using HTTPS. Learn more about HTTPS and SSL Certificates.
Hide errors from visitors: ❌Error messages should not be shown to visitors.

### Active Plugins (10) ###

Advanced Custom Fields PRO: by Elliot Condon – 5.7.7
Classic Editor: by WordPress Contributors – 0.4
Formidable Forms: by Strategy11 – 3.04.01
Health Check & Troubleshooting: by The WordPress.org community – 1.2.1
Jetpack by WordPress.com: by Automattic – 6.6.1
Standard Stuff (SternData): by Stern Data Solutions – 2018.06.19
Show Current Template: by JOTAKI Taisuke – 0.3.0
WC Custom Add to Cart labels: by Rynaldo Stoltz – 1.1
WooCommerce PayPal Checkout Gateway: by WooCommerce – 1.6.4 – Not tested with the active version of WooCommerce
WOOF - WooCommerce Products Filter: by realmag777 – 2.2.1 – Not tested with the active version of WooCommerce

### 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)
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: #18 - /jewelry/
Cart: #83 - /jewelry/shopping-bag/
Checkout: #85 - /jewelry/checkout/
My account: #87 - /jewelry/my-shopping-bag-account/
Terms and conditions: #89 - /jewelry/terms-and-conditions/

### Theme ###

Name: Indulgence Studios
Version: 1.0.1
Author URL: https://whatagreatwebsite.net
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: indulgence/woocommerce/single-product/related.php