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Preview Web Part in Web Part Gallery does not work

Asked By: Adriane Coffey Date: Apr 16, 2009 Category: Sharepoint Views: 1236

I have created a custom web part and deployed it on WSS 3.0. I am able
to add the web part to any web part page and it renders fine. I also
have some events in the web part. Now when I try to preview the web
part in the web part gallery, here is what I get

An error occured when previewing the Web Part. at
Microsoft.SharePoint.WebPartPages.WebPartPreview.CreateChildControls()
at System.Web.UI.Control.EnsureChildControls()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Tagged:preview web part in gallery does not work

2 Answers Found

Answer #1 Answered By: Mia Scott Answered On: Apr 16, 2009

Did you configure Visual Studio to debug your webpart
on the server? This will show you which line of code
in your webpart is throwing the error.

article on debugging webparts:
blogs.msdn.com/.../how-to-debug-a-web-part-for-sh\
arepoint-2007.aspx

Answer #2 Answered By: Kristian Chaney Answered On: Apr 16, 2009

I did configure Visual Studio to debug the
web part. However, since the error occurs not when loading the web
part page where the web part is hosted, but when the web part is being
previewed in web part gallery (Site Collection Admin has access to
this gallery), I cannot really debug the webpart. It has something to
do with WebPartPreview mode which I am not able to figure out. Please
provide me some insight if you have come across this problem on any
custom web part.

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