[BUG] System.InvalidCastException: Unable to cast object of type 'System.String' to type 'System.Enum'.

[BlueNinjaOut]

i wanted to try this fflags from your discord server and i keep getting this bug. heres the fflags:
{
"DFIntTaskSchedulerTargetFps": "999999",
"DFIntServerTickRate": "60",
"DFIntServerPhysicsUpdateRate": "60",
"DFIntPlayerNetworkUpdateRate": "60",
"DFIntPlayerNetworkUpdateQueueSize": "20",
"DFIntOptimizePingThreshold": "50",
"DFIntNetworkPrediction": "120",
"DFIntNetworkLatencyTolerance": "1",
"DFIntMinimalNetworkPrediction": "0.1",
"DFIntConnectionMTUSize": 900,
"DFIntRakNetResendRttMultiple": "1",
"DFIntRaknetBandwidthPingSendEveryXSeconds": "1",
"FFlagOptimizeNetwork": "True",
"FFlagOptimizeNetworkRouting": "True",
"FFlagOptimizeNetworkTransport": "True",
"FFlagOptimizeServerTickRate": "True",
"FFlagEnableNewInput": "True",
"FFlagDebugDisableParticles": "True",
"FFlagDebugDisableGuiEffects": "True",
"FFlagDebugDisableLODFoliage": "True",
"FFlagDebugForceLowGraphics": "True",
"FFlagDebugDisableMaterialSpecular": "True",
"FFlagDebugDisableLightingTechnologyFeatures": "True",
"FFlagDebugDisableRenderingPostEffects": "True",
"FFlagDebugForceDisableShadows": "True",
"FFlagDisablePostFx": "True",
"FIntRenderShadowIntensity": "0",
"DFIntGraphicsQualityLevel": 1,
"DFIntTextureQualityOverride": 1,
"FFlagEnableTerrainOptimizations": "True",
"FFlagRenderCBRefactor2": "True",
"FFlagUseDynamicSun": "False",
"FFlagAnimatePhysics": "False",
"FFlagUseDeferredContext": "False"
}