Error .Its urgent

[sureshneela]

Hi ,
            I am getting the following error when I schedule the report to run backend.Report is Failing.


Error is QE-DEF-0478 Invalid coercion from 'value' to 'string'

I used following DataItem - maximum((case when Indicator='A' then (1) else (0) end) for PlanID,PaymentID)

By using this I am getting the follwing Error.

But when I run the report normal at frontend  I am able to get the output.

Please help anyone ....