Hello Amit,
Since the report runs in report designer did you add the parameters in maximo when creating the report? Do you see the parameters to enter values when running the report in maximo? If you did not add the parameters in maximo that would cause your error.
Also, you may need to increase the logging level for the report root logger to DEBUG and the birt logger to DEBUG to get more details about the error in the log files.
Regards,
Jim