I’m on Step-7 in this tutorial,
and try this command:
bench get-app erpnext GitHub - frappe/erpnext: Free and Open Source Enterprise Resource Planning (ERP) --branch version-12
but facing this error message:
└─[$]> bench get-app https://github.com/frappe/erpnext --branch version-12
/home/tri/frappe-bench/env/bin/python: Error while finding module specification for 'frappe.utils.bench_helper' (ModuleNotFoundError: No module named
'frappe')
A directory for the application "erpnext" already exists.
Do you want to continue and overwrite it? [y/N]: y
INFO:bench.app:Getting app erpnext
$ git clone https://github.com/frappe/erpnext --branch version-12 --depth 1 --origin upstream
Cloning into 'erpnext'...
remote: Enumerating objects: 6118, done.
remote: Counting objects: 100% (6118/6118), done.
remote: Compressing objects: 100% (4951/4951), done.
remote: Total 6118 (delta 1732), reused 2724 (delta 1042), pack-reused 0
Receiving objects: 100% (6118/6118), 17.65 MiB | 97.00 KiB/s, done.
Resolving deltas: 100% (1732/1732), done.
INFO:bench.app:installing erpnext
$ ./env/bin/pip install -q -U -e ./apps/erpnext
$ ./env/bin/pip install -q -U -e ./apps/erpnext
Traceback (most recent call last):
File "/usr/local/bin/bench", line 11, in <module>
load_entry_point('bench', 'console_scripts', 'bench')()
File "/home/tri/.bench/bench/cli.py", line 41, in cli
bench_command()
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/tri/.bench/bench/commands/make.py", line 62, in get_app
get_app(git_url, branch=branch, skip_assets=skip_assets, overwrite=overwrite)
File "/home/tri/.bench/bench/app.py", line 143, in get_app
install_app(app=app_name, bench_path=bench_path, verbose=verbose, skip_assets=skip_assets)
File "/home/tri/.bench/bench/app.py", line 181, in install_app
quiet=quiet_flag, app=app_path, no_cache=cache_flag))
File "/home/tri/.bench/bench/utils.py", line 270, in exec_cmd
return subprocess.call(cmd, cwd=cwd, universal_newlines=True)
File "/usr/lib/python3.6/subprocess.py", line 287, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: './env/bin/pip': './env/bin/pip'
I have try to reinstall pip3, but still got that error.
Please, any help, or tutorial or source to solve this would be very appreciated, thanks 
)