Error during installing erpnext

bench@user-VirtualBox:~/erpnext$ bench init erpnext && cd erpnext
Traceback (most recent call last):
File “/usr/local/bin/bench”, line 11, in
load_entry_point(‘bench’, ‘console_scripts’, ‘bench’)()
File “/opt/bench/bench-repo/bench/”, line 40, in cli
File “/usr/local/lib/python2.7/dist-packages/click/”, line 764, in call
return self.main(*args, **kwargs)
File “/usr/local/lib/python2.7/dist-packages/click/”, line 717, in main
rv = self.invoke(ctx)
File “/usr/local/lib/python2.7/dist-packages/click/”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/usr/local/lib/python2.7/dist-packages/click/”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/usr/local/lib/python2.7/dist-packages/click/”, line 555, in invoke
return callback(*args, **kwargs)
File “/opt/bench/bench-repo/bench/commands/”, line 31, in init
python = python)
File “/opt/bench/bench-repo/bench/”, line 64, in init
raise ValueError(‘Bench Instance {path} already exists.’.format(path = path))
ValueError: Bench Instance erpnext already exists.

For clues a forum search on the above gives for example this to try "bench init erpnext && cd erpnext" error