BPC Error on dbo.Defaults when enter in the admin console

Hi experts,

We were modifiying the appset web parameters and after that we could not enter in the administration console and the system returns next error: "Error message:Cannot insert duplicate key row in object dbo.defaults with unique index IX_tblDefaults. The statement has been terminated"

We've tried to restart the appset parameters into initial values but we got error again and again.

How can we solve this issue? Do Anybody have the same problem before?

Regards.