Error in content type deployment while visual studio deployment .Content type Id already exists for this feature ID

I encountered a starnge error.I just created a content type through Visual studio 2012 using some site columns deployed it ,it worked fine.But now I made some changes and try to redeploy it.It poped up with a errror stating "Content type with the ID ______ in the feature ID ________ already exists"


I tried retract and deploy again and again it dint work

The trick was .

1) Retract the solution
2)Close the Visual studio
3)Restart and redploy
4)It will work fine .