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Hi vinayvarma,
I suggest you paste the code that is triggering this error in order for the Community to be able to help.
I suggest you look at the Appian logs (the stdOut is the place to go to). One common error is where a datetime field has an invalid value in it (e.g. a datetime might contain '0000-00-00 00:00'), but the logs will give you the definitive error.