Error while installing app or when reporting error

I tried to install app in ERPNext which i am trying on my local machine with VM.
Following error is appearing whenevr i tried to install an app or try to send error report…

I am a new user. Kindly guide me clearly.

Traceback (innermost last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 57, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 19, in handle
execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 36, in execute_cmd
ret = frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 806, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/page/applications/applications.py”, line 79, in install_app
frappe.installer.install_app(name)
File “/home/frappe/frappe-bench/apps/frappe/frappe/installer.py”, line 124, in install_app
sync_for(name, force=True, sync_everything=True, verbose=verbose)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/sync.py”, line 49, in sync_for
update_progress_bar(“Updating {0}”.format(app_name), i, l)
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/init.py”, line 331, in update_progress_bar
sys.stdout.flush()
IOError: [Errno 32] Broken pipe

Add this in bench