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Check for [XmlRoot(Namespace = “ClassNameSpace”)] in top of ur class definition, remove this statement and deploy again and see what happens. I got the same error mentioned and when I remove the above statement it works fine with me…
Incompatible Web Part markup detected. Use “.dwp web part XML instead of *.webpart web part xml
23 Thursday Apr 2009
Posted in Sharepoint
All About SharePoint 
I have a webpart that originally used a .dwp file which I replaced with a .webpart file.
The problem is that my webpart uses the statement mentioned above and it can’t work without it.
Right now my choises are:
1. Leave the statement and use a .dwp file – Unacceptable.
2. Remove the statement and use a .webpart file – Doesn’t work.
I need to use a .webpart file, so option 1 is not good for me.
Any idea?
Hi Lesh_MLesh_M:
.webpart or .dwp are just xml file. If you have source code, you can rebuild it to a .webpart extension.