Hosting in IIS 8 and Google Indexing.

Question

Hosted a website in IIS 8.5. 

 

Recently changed my website url from http://domain  to http://www.domain.

I have submitted the new url for indexing in google search console.  

 

Getting an error in search console as Duplicate without user-selected canonical .

how to resolve this error so that google starts indexing the pages.