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When loading up 3.4 RC1, I'm getting about 30 warnings about a module's .xml files already being in the Default System. I have to click OK on 30 dialog boxes to get through this. This issue may be related to issue #26247, please view that one as well. The same error log is attached here.
Created attachment 7004 [details] error logs...
they are the same thing. Your userdir is corrupted by the installer. See my comments in issue 26247 *** This issue has been marked as a duplicate of 26247 ***
verified, closed - it's duplicate.