Application Mapping object is not valid: An existing record is already in use.

Document ID : KB000108017
Last Modified Date : 21/08/2018
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Issue:
Errors seen while importing Application Mappings from a csv file. 
Application Mapping object is not valid: An existing record is already in use. 
Resolution:
The message Indicates that a duplicate entry was not imported. It is normal for these errors to be present.

This is normal behavior when a duplicate is found.

You should verify that the application mappings look correct in the Admin->Application Mappings page, if so the applications should already be imported correctly.