Error of the Impromptu report when run at upfront

[srujana]

Hi All,

I have developed an impromptu report which runs fine at our end, but when it is deployed to upfront the following error is generated-
"
Application Error
Page generation error while preparing a page based on template: iwr_modifyprompts.utml.
The content request 'DescribeNewsItem' has failed.
There was a syntax error in the XML response.
Please contact your administrator.
"
What could be the possible reasons and how do we rectify this?

Thanks in Advance,
Srujana