Error retrieving data for an estimate.

Error:

"Error Staging Data

No data was returned by Sage Estimating.

This could be caused if the estimate you selected is currently open (locked) in Sage Estimating. Close the estimate and then try again."

Any idea what might be the reason for the issue. I am trying to retrieve results programmatically and no others users are using the estimate simultaneously.

Has anyone faced this issue before?

Please let me know if more information required.