SubSites WebPart "an external component has thrown an exception"

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Hi all,

I would like to customize a template changing the default.aspx.

I want to show the SubSites WebPart
(http://www.microsoft.com/sharepoint/downloads/components/detail.asp?a1=413),
but when I change the page, (adding de register tag and the WebPart)
this error is shown: "An external component has thrown an exception".

If I add the control modifying the page I have no problem.

I would like to disable the custom error but modifying the web.config
(custom errors: off) it is not enought. How could I do it?



The steps I have followed are:

1) Register the webpart as safe
2)add the .dll to the GAC
3)modify the default.aspx:
<%@ Register TagPrefix="WpNs1" Namespace="SubSites" Assembly="SubSites,
Version=1.1.0.0, Culture=neutral, PublicKeyToken=2715b3a91cb84b87" %>

and

<WpNs1:SubSites runat="server" />


Do you know what can I do??

Thank you very much

.

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