Hi
As per the error logs that you have attached, I came across one KBA which deals with the same. Kindly refer to the below KBA and implement the resolution part of it.
1707793 - Portal Runtime Error when a Business Package application or an application connecting to the backend system is accessed on SAP Netweaver Enterprise Portal
Please review the SAP Knowledge Base Article (KBA) provided in this reply. We would appreciate your feedback on the same. You can provide this via the Overall Rating at the top right corner of the KBA. Click on the stars to provide your feedback.
Regards
Santarshi Samanta