Keepass file Line-length exception.

[korynt]

Hello. I forgot part of my keepass' password and trying to recover it. Forgotten part happened to be just 3 digits hence it shoudn't be hard to crack it. But I cant load *.kdbx file in hashcat and everything comes down to Line-length exceptions and not so happy "Hash 'x.kdbx': Line-length exception No hashes loaded" at the end. What I'm doing wrong here?