Why am I receiving a 500 error when attempting to access the Bold Product Upsell app?
You may be experiencing a 500 error due to browser cache and cookies. Try clearing your browser cache and cookies and ensure third-party cookies are enabled. For step-by-step directions, please visit this Help Center article: https://support.boldcommerce.com/hc/en-us/articles/25738241131284-App-Access-Troubleshooting