difficulty in migrating the test cases from excel to TFS2013.

Jun 26, 2015 at 8:46 AM
While clicking on save and migrate in , it shows the following errors :
  • Failed - Migrate Work Items - TF237124: Work Item is not ready to save
  • Failed - Process Links - Object reference not set to an instance of an object.
  • Failed - Publish Report - No Workitems are migrated.
Please help if you have any idea to remove this errors. thanks in advance..