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CreateNamedNetDriver failed to create driver from definition GameNetDriver

I've made a project using the Cardinal Menu System and Advanced Sessions and Advanced Steam Sessions plugins. When joining a session through steam, the game crashes with a popup saying "unreal assertion failed: NetDriver pendingnetgame.cpp line:43" and this in the log:

 LogNet: CreateNamedNetDriver failed to create driver from definition GameNetDriver
 LogNet: CreateNamedNetDriver failed to create driver PendingNetDriver from definition GameNetDriver

Joining has worked previously in this same project, and I don't know what I have changed that broke it. My DefaultEngine.ini has these relevant lines:


I'm not sure what to try, I've rebuilt the plugins to no effect. Thanks for any guidance.

Product Version: UE 4.16
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asked Jul 12 '17 at 09:58 PM in Using UE4

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