adding worker with password missmatch

when adding worker with not matching password there is an error:

KeyError at /doctors/add/STAFF
'password'
Request Method:	POST
Request URL:	http://localhost:8000/doctors/add/STAFF
Django Version:	1.10.7
Exception Type:	KeyError
Exception Value:	
'password'
Exception Location:	/home/gawi/workspace/scheduling-system/smash/web/forms/worker_form.py in clean, line 89
Python Executable:	/home/gawi/workspace/scheduling-system/env/bin/python
Python Version:	2.7.12
Python Path:	
['/home/gawi/workspace/scheduling-system/smash',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7/plat-x86_64-linux-gnu',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7/lib-tk',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7/lib-old',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7/lib-dynload',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/home/gawi/workspace/scheduling-system/env/local/lib/python2.7/site-packages',
 '/home/gawi/workspace/scheduling-system/env/lib/python2.7/site-packages']
Server time:	Mon, 9 Jul 2018 12:25:47 +0000