Error: value seq is not a member of object slick.dbio.DBIO
You need to import the API for the database you are using:
import slick.driver.PostgresDriver.api._
I'm not sure if you've got your answer (I'm answering for those that may stumble upon this in the future), but I've resolved this by upgrading to 3.0.0-M1 and using Action.seq() instead of DBIO.seq()
This may also work in 3.0.0, but I'm not sure as I upgraded from Slick 2.x to 3.0.0-M1!