Getting fatal error when installing Kaltura CE6 from GitHub respositories

Dear Community.

I have been following the excellent instructions at https://github.com/kaltura/ce-packager to self install kaltura CE6 on a Centos 6.4 AWS instance. I keep getting the following fatal error after executing

git submodule update --init

[ec2-user@ip-172-31-43-64 ce-packager]$ git submodule update --init
Submodule ‘git-repositories/KalturaServer’ (https://github.com/kaltura/KalturaSer…) registered for path 'git-repositories/KalturaServer’
Submodule ‘git-repositories/ce-binaries’ (https://github.com/kaltura/ce-binarie…) registered for path 'git-repositories/ce-binaries’
Submodule ‘git-repositories/ce-branding’ (https://github.com/kaltura/ce-brandin…) registered for path 'git-repositories/ce-branding’
Submodule ‘git-repositories/ce-configurations’ (https://github.com/kaltura/ce-configu…) registered for path 'git-repositories/ce-configurations’
Submodule ‘git-repositories/ce-dwh’ (https://github.com/kaltura/ce-dwh.git) registered for path 'git-repositories/ce-dwh’
Submodule ‘git-repositories/ce-uiconfs’ (https://github.com/kaltura/ce-uiconfs…) registered for path 'git-repositories/ce-uiconfs’
Submodule ‘packaging/package_skeleton/app/web/content/docs’ (https://github.com/kaltura/ce-docs.git) registered for path 'packaging/package_skeleton/app/web/content/docs’
Initialized empty Git repository in /home/ec2-user/ce-packager/git-repositories/KalturaServer/.git/
remote: Reusing existing pack: 57087, done.
remote: Counting objects: 9, done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 57096 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (57096/57096), 130.42 MiB | 10.83 MiB/s, done.
Resolving deltas: 100% (37736/37736), done.
fatal: reference is not a tree: b067da1a1a02f68db989399fb7c05b666d7ed3b1
Unable to checkout ‘b067da1a1a02f68db989399fb7c05b666d7ed3b1’ in submodule path ‘git-repositories/KalturaServer’
[ec2-user@ip-172-31-43-64 ce-packager]$

I have tried installing on a ubuntu platform which fails at the same point.

Can anyone give me a hint?

Phil

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