Error when trying to get and install customized app

ERPNext
1

When trying to get a customized app (in a git repository), I get this error:

Checking connectivity... done.
('installing', u'customized_app')
INFO:bench.app:installing customized_app
INFO:bench.utils:./env/bin/pip install -q  -e ./apps/customized_app --no-cache-dir
Command "python setup.py egg_info" failed with error code 1 in /home/frappe/frappe-bench/apps/customized_app
Traceback (most recent call last):
  File "/usr/local/bin/bench", line 11, in <module>
    load_entry_point('bench', 'console_scripts', 'bench')()
  File "/home/frappe/bench-repo/bench/cli.py", line 40, in cli
    bench_command()
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/frappe/bench-repo/bench/commands/make.py", line 40, in get_app
    get_app(git_url, branch=branch)
  File "/home/frappe/bench-repo/bench/app.py", line 135, in get_app
    install_app(app=app_name, bench_path=bench_path, verbose=verbose)
  File "/home/frappe/bench-repo/bench/app.py", line 179, in install_app
    find_links=find_links))
  File "/home/frappe/bench-repo/bench/utils.py", line 159, in exec_cmd
    raise CommandFailedError(cmd)
bench.utils.CommandFailedError: ./env/bin/pip install -q  -e ./apps/customized_app --no-cache-dir

Is it an issue or there is a trick to getting the app correctly and then install it?

erpnext 10.1.48
frappe 10.1.45

Thanks in advanced