Drees,
The cause of this error is that u must be having a typo somewhere with "fields" while defining the field under a class.

You can trace this by looking at your terminal, or if you dont have it, simply check your defined fields and see if you have any typo like that...

Hope it helps !

Hi,

Can you post all the message error and you python code ?

I have the same error like you when I write field without s:

I got message error :

So check your code and find the error syntax.

Best regards,