Issue
When executing a Chain using the (E)PBCS BizApp, encountering:
Error reading list files response: invalid character '<' looking for beginning of value
This is often caused by specifying a Base URL override in the BizApp Connection that includes /HyperionPlanning

The (E)PBCS BizApp Connection will create the URL based on the properties defined:
Service Name
Domain Name
Data Center
For example, using the input in the above screenshot would generate the following URL:
If your organization has a non-standard URL, then the Base URL Override can be used but should not include any additional pathing after .com