Blender Rigify to UE 5.8 GASP

I am trying to export my Blender Rigify Character Rig to Unreal and have a problem.

I get these 3 errors when trying to use the Reatargeter:
Trying to auto-generate a retargeter but no template was compatible with the target mesh.
IK Retargeter could not find target root bone, None in mesh Herath
IK Retargeter unable to initialize target root, ‘None’ on skeletal mesh: ‘Herath’
Root Motion Remap Op, missing target pelvis bone None.

I tried pretty much everything I found online to fix the bone hierarchy but nothing worked.
The imgur video shows the approach that made the most sense to me.
I created a normal Metarig in Blender, upgraded the face and generated a Game Rig with the GameRig Feature Set ( GameRig/README.md at main · Arminando/GameRig · GitHub ) for Rigify. Then I exported it with the settings shown in the video and imported it with default settings in Unreal.
For Retargetting i followed this tuorial from YouTube: https://www.youtube.com/watch?v=XPSKt_sVZek

If I forgot to add any info that would be useful or is needed, please let me know and thanks for your help in advance.