Error :Cannot insert record more than once when loading data access for user

Summary:

Cannot insert record more than once when loading data access for user

Content (please ensure you mask any confidential information):

Setup and Maintenance > Manage data access for users

Query the usernname , click search to view the security context value already assigned to user.

Click on Authorize data access button to generate the import template.

Add the rows to be loaded and click on upload button

i am getting the error :Cannot insert record more than once when i try to upload the data access for user via the Authorize data access template .

The data access security does not exist for users