Mime type for Microsoft Office 2007-2010

.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.xltx application/vnd.openxmlformats-officedocument.spreadsheetml.template.potx application/vnd.openxmlformats-officedocument.presentationml.template.ppsx application/vnd.openxmlformats-officedocument.presentationml.slideshow.pptx application/vnd.openxmlformats-officedocument.presentationml.presentation.sldx application/vnd.openxmlformats-officedocument.presentationml.slide.docx application/vnd.openxmlformats-officedocument.wordprocessingml.document.dotx application/vnd.openxmlformats-officedocument.wordprocessingml.template.xlam application/vnd.ms-excel.addin.macroEnabled.12.xlsb application/vnd.ms-excel.sheet.binary.macroEnabled.12

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to… web.config issue

I have a problem like this on server [A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from ‘System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ in the context ‘Default’ at location ‘C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll’. Type…