rom flashing – Do I need a ‘vbmeta’ parititon to install GSI

Following the official GSI installation instructions from google, they say to run fastboot --disable-verification flash vbmeta vbmeta.img.

When I run that, I get the following message:

Rewriting vbmeta struct at offset: 0
Sending 'vbmeta' (4 KB)                            OKAY (  0.010s)
Writing 'vbmeta'                                   FAILED (remote: 'This partition doesn't exist')
fastboot: error: Command failed

Does this mean dm-verity is not in use, and I can ignore this message? Do I need to make a partition? How do I do that?

Right now the GSI image is not booting for me.

I am flashing onto the Blackview BV5500 Pro, if it matters.