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If I attempt to add the XML Tree Editor module to your list of modules to install from the Alpha Update Center on the "Select Modules To Install" screen of the Update Center dialog, I receive an error about dependencies on a tax module. It reports that a module it is dependent on can be downloaded, but not enabled. I'm attaching a screenshot of the error.
Created attachment 12404 [details] This is a ccreenshot of the error.
It has already been fixed. See also the issue 36527 and 38267.
Fix Verified, in 6.0 Beta2 build 200710151100