Some flask errors

I get these error when i do a Post /transactions/new request. All seems to works fine when make a get /mine request
Some kind of help?

_**File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\xxx\.virtualenvs\Scripts-GEA1qG99\lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File ".\blockchain.py", line 238, in new_transaction
if not all(k in values for k in required):
File ".\blockchain.py", line 238, in
if not all(k in values for k in required):**_