MassSpawner crashing game

Hi everyone,
I recently learned about MassGameplay features in Unreal Engine 5 and wanted to try them out. Everything works fine if I create a blank project and enable appropriate plugins.

When I add MassGameplay (and related) features to my prototype game project, it causes the game to crash when I use ‘Play in Editor’. Error message:

Assertion failed: Result.SpawnDataProcessor != nullptr [File:D:\build\++UE5\Sync\Engine\Plugins\Runtime\MassGameplay\Source\MassSpawner\Private\MassSpawner.cpp] [Line: 428]

UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_MassSpawner
UnrealEditor_AIModule
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Any thoughts / suggestions on what is causing this and how to fix it?

Thanks!

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I have the same problem.