400 Bad Request Error

when i save document using post method it gives error “400 bad request”.how it solve?

Check the logs on your server frappe-bench/logs/frappe.log

Request Error
Traceback (most recent call last):
File “/home/brillare/frappe-bench/apps/frappe/frappe/app.py”, line 61, in application
response = frappe.api.handle()
File “/home/brillare/frappe-bench/apps/frappe/frappe/api.py”, line 115, in handle
data = json.loads(frappe.local.form_dict.data)
File “/usr/lib/python2.7/json/init.py”, line 339, in loads
return _default_decoder.decode(s)
File “/usr/lib/python2.7/json/decoder.py”, line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File “/usr/lib/python2.7/json/decoder.py”, line 382, in raw_decode
raise ValueError(“No JSON object could be decoded”)
ValueError: No JSON object could be decoded
[ERROR] 2017-07-14 06:52:38,684 | /home/brillare/frappe-bench/apps/frappe/frappe/utils/error.py:

Body is not in json form