"The relationship group and designation type must be unique." while importing a Benefit Program

Summary

Option: JBO-BEN:::BEN_PDPLN_RLSHP_DSGN_UNQ: The relationship group and designation type must be unique.Verify that no preexisting configuration for the same relationship group and designation type exi

Content

I'm trying to import a Benefit Program in the target environment. The previous developer had configured a few items like Plan Type,Eligibility Profiles and Options. 

So when I tried to export,I was getting several errors so I ended up deleting all the Eligibility Profiles,Options,Life Events etc. I had renamed all the Plan Types to another name with the same effective date it was created '01/01/1951'.