We're new to DNN. Started working on our own skin and tried installing it on the server via the Host Extensions interface. After loading, going to Extensions now brings up "A critical error has occurred. Object reference not set to an instance of an object."

We then deleted the folder the skin was in, but the error is still showing. The Event Viewer shows this:

AssemblyVersion: 5.6.1
PortalID: 0
PortalName: Sandbox
UserID: 4
UserName: mitchell
ActiveTabID: 36
ActiveTabName: Extensions
RawURL: /dnninstall/Host/Extensions/tabid/36/portalid/0/Default.aspx
AbsoluteURL: /dnninstall/Default.aspx
AbsoluteURLReferrer: http://dtqdnn/dnninstall/home.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 0f2057d9-8234-490c-a290-df932c680775
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.Extensions.grdPackages_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.Extensions.BindGrid() at DotNetNuke.Modules.Admin.Extensions.Extensions.OnLoad(EventArgs e) 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 ---
Source:
Server Name: DTQDNN


How do I get the Extensions page to work again? How do I back out a bad skin package when we make a mistake like this again?

Thanks in advance!

in addition to Chris' advice, you may try removing skin folder from /portals/_default/skins (or /portals/=/skins), if it contains offending code.

---

Cheers from Germany,
Sebastian Leupold

   

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Just a note... I use the SQL module to delete the row related to this skin from the Packages table, and it appears to have worked. I can now access the Extensions module again.

And our second attempt at building a skin is working much better. :)