repo errors in the mac branch

[GinoLP]

when i try to repo init with the mac branch with either :
repo init -u https://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git -b twrp-8.1-macOS
or
repo init --depth=1 -u https://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git -b twrp-8.1-macOS
I get this repo error

fatal: manifest 'default.xml' not available
fatal: invalid "path": TeamWin/.repo/frameworks/base: bad component: .repo

Repo command failed: UpdateManifestError
Unable to sync manifest default.xml

this do not happens when i try the twrp-9.0 branch