SharePoint Server Error in '/' Application. The resource cannot be found.

I was getting the following error when trying to access the SharePoint site.

Server Error in '/' Application.

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The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested URL: /sites/companyname/default.aspx

Solution:

My SharePoint site was running in port 80. In IIS, I noticed that the Default Web Site, that is supposed to be stopped, was running. I stopped the Default Web site and the SharePoint site is up and running