please help me!
Error happened during language packs installation(host->extensions)
"Object reference not set to an instance of an object."

AssemblyVersion: 5.2.0
PortalID: 0
PortalName: My Website
UserID: 1
UserName: host
ActiveTabID: 36
ActiveTabName: Extensions
RawURL: /tabid/36/ctl/Install/rtab/36/portalid/0/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://coy468.codns.com/tabid/36/ctl/Install/rtab/36/portalid/0/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 39acc749-f44e-4171-bc28-67d7ff4bfde5
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Services.Installer.Installers.LanguageInstaller.ReadCustomManifest
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Services.Installer.Installers.LanguageInstaller.ReadCustomManifest(XPathNavigator nav) at DotNetNuke.Services.Installer.Installers.FileInstaller.ReadManifest(XPathNavigator manifestNav) at DotNetNuke.Services.Installer.Installers.InstallerFactory.GetInstaller(XPathNavigator manifestNav, PackageInfo package) at DotNetNuke.Services.Installer.Installers.PackageInstaller.ReadComponents(XPathNavigator manifestNav) at DotNetNuke.Services.Installer.Installers.PackageInstaller.ReadManifest(XPathNavigator manifestNav) at DotNetNuke.Services.Installer.Installer.ProcessPackages(XPathNavigator rootNav) at DotNetNuke.Services.Installer.Installer.ReadManifest(Stream stream) at DotNetNuke.Services.Installer.Installer.ReadManifest(Boolean deleteTemp) at DotNetNuke.Modules.Admin.Extensions.Install.wizInstall_NextButtonClick(Object sender, WizardNavigationEventArgs e) at System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e) at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String EVENT_ARGUMENT) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: DNN