Unable to render the data error bdc sharepoint 2016

Created an external list SharePoint 2016 using business data connectivity services, configured secure store target application and created external list in SharePoint.The external list displayed this error message with a correlation ID as "Unable to render the data. If the problem persists, contact your web server administrator."

ULS Log viewer found this message in the logs:

Error while executing web part: Microsoft.BusinessData.Infrastructure.BdcException: The shim execution failed unexpectedly - Unable to obtain the application proxy for the context.. ---> Microsoft.Office.SecureStoreService.Server.SecureStoreServiceException: Unable to obtain the application proxy for the context.

Solution:

The web application is not associated with the secure store service application.

1. Go to SharePoint Central Administration site
2. Navigate to Application management >> Click on Configure service application associations under Service Applications.
3. Select the web application in which your site exist, Check the "Application proxy group" column >> Make sure the BDC and secure store service applications check boxes checked.