Assertion failed: IsValid() [File:d:\build\++portal+release-live+compile\sync\engine\source\runtime\core\public\Templates/SharedPointer.h] [Line: 851]

Development Getting Started & Setup
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Did you get the latest installer from epic games ?
In my case I uninstalled everything from the windows menu then got the latest msi and installed again. I got a kind of mini update when the installer launched and it fixed my problème.