I am a newdie to DNN...After deleting a container from the Host > Extensions I received " A critical error has occurred.Object reference not set to an instance of an object." Now I cannot see my Extension's Page. I checked the Log Viewer and this is what it states:

AssemblyVersion: 6.0.2

PortalID: 0

PortalName: DNN Test Website

UserID: 5

UserName: IBleedBlue

ActiveTabID: 36

ActiveTabName: Extensions

RawURL: /Host/Extensions/tabid/36/portalid/0/Default.aspx

AbsoluteURL: /Default.aspx

AbsoluteURLReferrer:  Admin/LogViewer.aspx

UserAgent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)

DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider

ExceptionGUID: d5186cb2-cb85-4b4a-8d99-f1e0ed3032ef

InnerException: Object reference not set to an instance of an object.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: DotNetNuke.Services.Installer.Packages.PackageController.CanDeletePackage

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.Packages.PackageController.CanDeletePackage(PackageInfo package, PortalSettings portalSettings) at DotNetNuke.Modules.Admin.Extensions.InstalledExtensions.extensionsGrid_ItemDataBound(Object sender, DataGridItemEventArgs e) at System.Web.UI.WebControls.DataGrid.CreateItem(Int32 itemIndex, Int32 dataSourceIndex, ListItemType itemType, Boolean dataBind, Object dataItem, DataGridColumn[] columns, TableRowCollection rows, PagedDataSource pagedDataSource) at System.Web.UI.WebControls.DataGrid.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) at DotNetNuke.Modules.Admin.Extensions.InstalledExtensions.BindGrid(String packageType, DataGrid grid, Label noResultsLabel) at DotNetNuke.Modules.Admin.Extensions.InstalledExtensions.extensionTypeRepeater_ItemDataBound(Object sender, RepeaterItemEventArgs e) at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) at DotNetNuke.Modules.Admin.Extensions.InstalledExtensions.BindPackageTypes() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

How do I get my Extension Page Back?!?! :-)

Thank You for your response, Sebastian. I have tried to retore the database, but it won't retore because it is saying that the database is in use. I have refreshed the app pool and restarted the database, no one else is messing around with it and still is stating that it is in use! Any ideas to get around this?

I actually took the database issue to the systems administrator. There were a few other problems with the database causing some conflicts. Thank You for your help, Sebastian!