Hi Vijaybir,
It is not useful that you paste your error code on the forum and hope that someone will come up with a solution. If you want help, you have to put in a little more effort. I think there are plenty of people on the forum who can help you if you provide more context.
The problem you're having is probably in the fact that you're doing an import somewhere somehow. Mendix sees that you have the same GUID (id) for two objects in your database and that is of course not possible since a GUID should be unique. This can especially happen if you're trying to merge data in any way.