When i run this command ikhlas3@ikhlas3:~/frappe-bench$ bench get-app erpnext https://github.com/frappe/erpnext?

Usage: bench [OPTIONS] COMMAND [ARGS]…

Error: No such command “frappe”.
Traceback (most recent call last):
File “/usr/local/bin/bench”, line 9, in
load_entry_point(‘bench==0.92’, ‘console_scripts’, ‘bench’)()
File “/home/ikhlas3/bench-repo/bench/cli.py”, line 60, in cli
bench()
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 610, in call
return self.main(*args, **kwargs)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 590, in main
rv = self.invoke(ctx)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 936, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 782, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/usr/local/lib/python2.7/dist-packages/click/core.py”, line 416, in invoke
return callback(*args, **kwargs)
File “/home/ikhlas3/bench-repo/bench/cli.py”, line 174, in get_app
_get_app(name, git_url, branch=branch)
File “/home/ikhlas3/bench-repo/bench/app.py”, line 56, in get_app
build_assets(bench=bench)
File “/home/ikhlas3/bench-repo/bench/utils.py”, line 166, in build_assets
run_frappe_cmd(‘build’, bench=bench)
File “/home/ikhlas3/bench-repo/bench/utils.py”, line 489, in run_frappe_cmd
raise CommandFailedError(args)
bench.utils.CommandFailedError: (‘build’,)

This is strange. Did you follow all the steps mentioned in the readme here: GitHub - frappe/bench: CLI to manage Multi-tenant deployments for Frappe apps?