[TYPO3-core] need help with submodules

[Steffen Gebert]

> I guess you ran into the same problem as me:
> http://wiki.typo3.org/TroubleShooting_(Git)#checkout_.3Cbranch.3E_fails_with_.22error:_Untracked_working_tree_file_....22
Thanks Philipp for adding this section!

Kind regards
Steffen

-- 
Steffen Gebert
TYPO3 v4 Core Team Member

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