Failed to extract the cab file in the solution / Root element is missing

Did you encounter the following error message?

Failed to extract the cab file in the solution.

I came across this message - in my case it was install a solution.

Another problem I had with the solution

Root element is missing.

After thorough testing - I found the solution
The Size of File wss.xsd was 0k
Is the stsadm command uses this file ????.... Yes!

All you need do is to copy from server that work correctly the file wss.xsd.

Those who do not know the file is sitting in

12Hive \TEMPLATE\XML for MOSS 2007

14Hive \TEMPLATE\XML for SharePoint 2010

The file is responsible for all schema of the SharePoint.

Hope I helped,
Roi Kolbinger