Trouble installing rng

[Fabianjr90]

After I run: python setup.py install within the rng folder, I get the following errors:

[1/1] Cythonizing ./rng/mt19937.pyx
warning: rng/mt19937.pyx:96:82: cdef variable 'rng' declared after it is used
warning: rng/mt19937.pyx:97:82: cdef variable 'rng' declared after it is used
warning: rng/mt19937.pyx:98:82: cdef variable 'rng' declared after it is used
warning: rng/mt19937.pyx:99:79: cdef variable 'rng' declared after it is used
warning: rng/mt19937.pyx:100:86: cdef variable 'rng' declared after it is used
fatal: bad revision 'HEAD'
running install
running bdist_egg
running egg_info
writing rng.egg-info/PKG-INFO
writing dependency_links to rng.egg-info/dependency_links.txt
writing top-level names to rng.egg-info/top_level.txt
reading manifest file 'rng.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching '.c' under directory 'src/common'
warning: no files found matching '.h' under directory 'src/common'
warning: no files found matching '.pxi' under directory 'src/common'
warning: no files found matching '.pxd' under directory 'src/common'
warning: no files found matching '.pyx' under directory 'src/common'
warning: no files found matching '.in' under directory 'src/common'
warning: no files found matching '.csv' under directory 'src/tests'
warning: no previously-included files found matching 'src/entropy.c'
warning: no previously-included files found matching 'src/dsfmt'
warning: no previously-included files found matching 'src/mt19937*'
warning: no previously-included files found matching 'src/mlfg_1279_861*'
warning: no previously-included files found matching 'src/pcg32*'
warning: no previously-included files found matching 'src/pcg64*'
warning: no previously-included files found matching 'src/xorshift128*'
warning: no previously-included files found matching 'src/xorshift1024*'
warning: no files found matching 'src/_version.py'
writing manifest file 'rng.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.7-x86_64/egg
running install_lib
running build_py
fatal: bad revision 'HEAD'
copying ./rng/mt19937.c -> build/lib.macosx-10.7-x86_64-3.6/rng
copying ./rng/array_fillers.pxi -> build/lib.macosx-10.7-x86_64-3.6/rng
copying ./rng/bounded_integers.pxi -> build/lib.macosx-10.7-x86_64-3.6/rng
UPDATING build/lib.macosx-10.7-x86_64-3.6/srs/_version.py
error: [Errno 2] No such file or directory: 'build/lib.macosx-10.7-x86_64-3.6/srs/_version.py'

Has this ever happened before? Do you have any advice on how to fix it? Thanks!