Hi,
When I tried to create a Delimited File data source using the DateRange function, I was able to create it successfully by following the below steps,
* Provide the File path as "{Path to the files}/^DateRange(…).log".
* Click on Test connection.
* Ensure the interpolation variable sequence which is,
> END_DATE: 2016/01/07
> START_DATE: 2016/01/01
* Again click on Test Connection, the connection establishes successfully.
For more information, you could refer to the instructions provided in the lab description "**DEN70EDUD1102LAB02 - Create a Delimited File data source using DateRange function**".
Hope this helps!