The operation could not be completed in MS-InfoPath

If the error: “Microsoft InfoPath. The operation could not be completed” arises, it would actually mean that you haven’t created a top level site collection.
First go to your Admin Site then follow the steps below.
On Site Collections, click on the Create site collections link.
Then from the drop down list, Select the web application where you wanted to create the site collection.
Give the title and the description then select “/” from the URL drop down list.
Then choose a template for your site and enter the primary site collection Administrator and OK.