getting error while doing on demand refresh (Datasource : web url)

Hi,

In power bi desktop data refresh works fine. After publishing the report into service then  refreshed the data then i am getting this error message.

Error message:

We're sorry, an error occurred during evaluation.;The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified The system cannot find the file specified. The exception was raised by the IDbCommand interface. Table: Table 1.

Thanks in Advance