please help me with this, how can i correct this
Hi Yogeshwar, if you click on the Missing Parent and Missing Child lines in the Report you should see which values are unmapped - a childless parent isn't necessarily an issue depending on whether you expect to have unused parents (e.g. categories or statuses which might only sometimes be used or were used in the past and no longer are) but you should never have parentless children or you'll have aggregation issues.
Once you see the unmapped child(ren) you'll either be able to manually map them to a parent or you might want to look at your load process and see whether you need to amend it to ensure all child values get either mapped or defaulted to a parent.