Resyncing bcoin brings up database version error
If you're running master, there was a recent migration that would cause this. 

you can run this to fix it:
node migrate/chaindb2to3.js /path/to/chaindb.ldb

That will take a very long time, but if you don't mind pruning your DB at the same time, you can run this instead and it will be much faster: 
node migrate/chaindb2to3.js /path/to/chaindb.ldb --prune

If that doesn't work you can always reset the DB and resync.
Just remove all .ldb files from ~/.bcoin dir and restart bcoin.