Users cannot access content on a site
The user might not have the necessary permission level to access the content on the site. Permission levels are inherited from user groups. Check the permission level for the user. For more information about permission levels, visit office.microsoft.com/en-us/windows-sharepoint-services-help/permission-levels-and-permissions-HA010100149.aspx and office.microsoft.com/en-us/windows-sharepoint-services-help/about-controlling-access-to-sites-and-site-content-HA010100144.aspx.