Syncing with treble manifests throws errors

[s3tupw1zard]

Hello,
I'm trying to sync up sources with this repository but it throws errors like remove-project element specifies non-existent project: platform/system/core
I'm trying to build DotOS treble GSI
Please help

[georg3-gg]

"After git clone you need to remove or delete replace.xml (.repo/local_manifests/replace.xml) if you're building any rom except AOSP GSI."

from Phhusson's "How to build a GSI?"