issue while using this API code

[mwaseemwali]

record fetching is perfectly work.

But while adding or updating or deleting the item i got this error

{"type":"error","message":"'NoneType' object has no attribute 'items'","traceback":"Traceback (most recent call last):\n File "Build\Lib\site-packages\flask\app.py", line 1982, in wsgi_app\n File "Build\Lib\site-packages\flask\app.py", line 1614, in full_dispatch_request\n File "Build\Lib\site-packages\flask_api\app.py", line 103, in handle_user_exception\n File "Build\Lib\site-packages\flask\_compat.py", line 33, in reraise\n File "Build\Lib\site-packages\flask\app.py", line 1612, in full_dispatch_request\n File "Build\Lib\site-packages\flask\app.py", line 1598, in dispatch_request\n File "Build\release\lib\spired\api\resource.py", line 79, in view\n File "Build\release\lib\spired\api\resource.py", line 152, in create\n File "Build\release\lib\spire\json_map.py", line 251, in fromJSON\n File "Build\release\lib\spire\json_map.py", line 89, in fromJSON\n File "Build\release\lib\spire\json_map.py", line 267, in fromJSON\nAttributeError: 'NoneType' object has no attribute 'items'\n","error_type":"AttributeError"}