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Packaged blueprint project doesn't load a custom plugin

Hi, I don't seem to have access to my custom plugin in a packaged blueprint project. It is all fine in editor, but when starting the packaged game the plugin refuses to load. I tried the simplest plugin, just with one blueprint printing hello and still nothing. The log from game says:

[2019.01.14-22.35.04:289][ 0]LogPackageName: Error: DoesPackageExist: DoesPackageExist FAILED: '/bluePlugin/NewBlueprint' is not a standard unreal filename or a long path name. Reason: Path does not start with a valid root. Path must begin with: '/Engine/', '/Game/', '/Paper2D/', '/CryptoKeys/', '/MeshEditor/', '/DatasmithContent/', '/VariantManagerContent/', '/MediaCompositing/', '/OculusVR/', '/SteamVR/', '/Config/', '/Script/', '/Memory/', or '/Temp/' [2019.01.14-22.35.04:289][ 0]LogStreaming: Error: Couldn't find file for package /bluePlugin/NewBlueprint requested by async loading code. NameToLoad: /bluePlugin/NewBlueprint

I have the plugin under Plugins in my project path. Is there a place I should declare the path to it again? Is it even possible to package a custom plugin in blueprint project? Just to mention I package easily in a c++ based project, but it is not optimal when working with a ready made blueprint one.

Product Version: UE 4.21
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asked Jan 14 '19 at 11:41 PM in Using UE4

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