Bala, the description you provided is not enough to have any insight on what the issue is. This message is quite generic and can be generated even when some data is exported if there are some records that fail or are rejected, for example due to rights issues.
Please provide more details on the steps you are executing, what are you exporting (story, model data, etc) and what kind of file you are exporting to. Also, are you sure that there are no messages indicating that some records were rejected even though most exported successfully?
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