"Cannot create note because it is empty"

[kashortiexda]

when I try to send to Anki (connection is fine with AnkiConnect) the message on KOReader says "Cannot create note because it is empty"

[nairyosangha]

Can you double check all fields in your config actually exist on your note type? Additionally, Anki does not let you create notes for which the first field is not filled in.
So if you have a note type with fields A, B, C and D, you have to fill something in for field A