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.

Error:
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.

Solution

Open PowerShell–>run as administrator
Run below script

cls
[system.reflection.assembly]::loadwithpartialname(“microsoft.sharepoint”)
$web = Get-SPWeb http://SP2010
$web.CustomMasterUrl = “/_catalogs/masterpage/v4.master”
$web.MasterUrl = “/_catalogs/masterpage/v4.master”
$web.Update()