Installation failure

[dawoodjee]

Environment
Ubuntu 18
ERPNext/Frappe version-12 (latest production)

frappe@scw-one-erp:~/frappe-bench-12$ sudo bench get-app telegram https://github.com/hanselke/erpnext-telegram
INFO:bench.app:getting app erpnext-telegram
INFO:bench.utils:git clone https://github.com/hanselke/erpnext-telegram  --depth 1 --origin upstream
fatal: destination path 'erpnext-telegram' already exists and is not an empty directory.
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/bench/cli.py", line 40, in cli
    bench_command()
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/frappe/.bench/bench/commands/make.py", line 41, in get_app
    get_app(git_url, branch=branch)
  File "/home/frappe/.bench/bench/app.py", line 125, in get_app
    cwd=os.path.join(bench_path, 'apps'))
  File "/home/frappe/.bench/bench/utils.py", line 161, in exec_cmd
    raise CommandFailedError(cmd)
bench.utils.CommandFailedError: git clone https://github.com/hanselke/erpnext-telegram  --depth 1 --origin upstream
frappe@scw-one-erp:~/frappe-bench-12$