Migration from i.MX8MPlus to A311D

I’m having an issue running reform-emmc-bootstrap. When I run it, I get the following error

I: no partition table found trying to open LUKS device
Device reform_crypt already exists.
     Logical volume reformvg/swap in use.
     Can't deactivate volume group "reformvg" with 2 open logical volume(s)

I’m not sure how to proceed. What are the prerequisites to running reform-emmc-boostrap?