Creating a site in frappe bench

I have tried add a site in frappe app,i am getting this error.
Help me to resolve this error.

frappe is not installed properly. Please try again with a fresh start. OR use

bench get-app

and try again

Thank you for the instruction.

I tried your instruction,then i got this error.

Check this thread,

i have added the site and installed erpnext app but when i tried to start the bench using the command (bench start)
i am getting this error.