Report designer error "LINKED_DATA_PROVIDER_REF_LIST"

Hi all,

I am creating a report in report designer but when I am executing report although report is showing data but at the selection screen it is giving the error "LINKED_DATA_PROVIDER_REF_LIST" as shown in below screenshot.

I am not able to figure out what is this error.

Also when I am trying to save report to PDF, I am getting the same error again, please see screenshot below:-

And Can I download the report created in Report designer to Excel as in other BEX tools? if yes, I am not getting this option, please let me know if any specific settings to be done for this.

Any help will be appreciated.

Thanks,
Ambika