SKSujith Kumar Rajkumar Syncfusion Team January 20, 2020 10:30 AM UTC
Greetings from Syncfusion support.
We checked your query with the attached sample and suspect this issue is due to package version mismatch that might have occurred on creating the project. As you have mentioned that the index file was copied from older version sample it might not be suitable for the latest dotnet version. So we suggest you to follow the steps provided in the below help documentation for creating the project,