Unable to display this Web Part (SharePoint Error)

"Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Windows SharePoint Services-compatible HTML editor such as Microsoft Office SharePoint Designer. If the problem persists, contact your Web server administrator"

I was with this wierd problem, when i got a migration project from 2003 to 2007 . I was trying to create DataView Webpart from a List. I created the List in the site and then DVWP from it, all went fine. I imported both into my Test Server from Dev,OOOOpppsssssssss it broke throwing the error.

It took almost 2 days finding all possible solutions to fix it none worked ,ya finally googled got lots of hits but none was feasible for me.

Finally i got an incredible simple solution 

The cause for this problem is a Sharepoint 2007 Designer BUG !!!! ,if you create a DVWP in Sharpeoint designer 2007 it will append the GUID of the LIST in the code and would link to DVWP, if you try to create a new List it will always create a new GUID which will never match up with the DVWP and it breaks.

This would be pretty simple once you know the trick.

Open the page having problem in Sharepoint Designer 2007 Search for "ListID" and replace with "ListName" and change the "DefaultValue=" to your List name, VIOLA !! this would fix it.

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