Multi Bench setup Issue

i changes files in config file… like 11000 to 11005, 12000 to 12005…
did bench setup nginx and made changes in nginx.conf file like 80 to 85 and 8000 to 8005 or 9000 to 9005.

even after that getting error while bench start.

19731:M 04 Feb 17:38:00.594 * The server is now ready to accept connections on port 13005
17:38:00 system | socketio.1 started (pid=19711)
17:38:00 socketio.1 | listening on *: 9005
17:38:01 web.1 | Traceback (most recent call last):
17:38:01 web.1 | File “/usr/lib/python3.5/runpy.py”, line 193, in _run_module_as_main
17:38:01 web.1 | “main”, mod_spec)
17:38:01 web.1 | File “/usr/lib/python3.5/runpy.py”, line 85, in _run_code
17:38:01 web.1 | exec(code, run_globals)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 97, in
17:38:01 web.1 | main()
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
17:38:01 web.1 | click.Group(commands=commands)(prog_name=‘bench’)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 764, in call
17:38:01 web.1 | return self.main(*args, **kwargs)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 717, in main
17:38:01 web.1 | rv = self.invoke(ctx)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 1137, in invoke
17:38:01 web.1 | return _process_result(sub_ctx.command.invoke(sub_ctx))
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 1137, in invoke
17:38:01 web.1 | return _process_result(sub_ctx.command.invoke(sub_ctx))
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 956, in invoke
17:38:01 web.1 | return ctx.invoke(self.callback, **ctx.params)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/core.py”, line 555, in invoke
17:38:01 web.1 | return callback(*args, **kwargs)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/click/decorators.py”, line 17, in new_func
17:38:01 web.1 | return f(get_current_context(), *args, **kwargs)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/apps/frappe/frappe/commands/init.py”, line 25, in _func
17:38:01 web.1 | ret = f(frappe._dict(ctx.obj), *args, **kwargs)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/apps/frappe/frappe/commands/utils.py”, line 497, in serve
17:38:01 web.1 | frappe.app.serve(port=port, profile=profile, no_reload=no_reload, no_threading=no_threading, site=site, sites_path=’.’)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/apps/frappe/frappe/app.py”, line 249, in serve
17:38:01 web.1 | threaded=not no_threading)
17:38:01 web.1 | File “/home/erpnext/YTPL_ERPNEXT/frappe-bench/env/lib/python3.5/site-packages/werkzeug/serving.py”, line 998, in run_simple
17:38:01 web.1 | s.listen(LISTEN_QUEUE)
17:38:01 web.1 | OSError: [Errno 98] Address already in use
17:38:02 system | web.1 stopped (rc=1