After you saved your migration (previous step from linked tutorial, specifically “Saving Data”) using command yarn rw prisma migrate dev
, you might need to make your first baseline as the error describes. Try;
yarn rw prisma migrate resolve --applied <the-last-migration-filename>
for example
yarn rw prisma migrate resolve --applied 20210316161829_my_lastest_migration
Documentation: Prisma Migrate | Database, Schema, SQL Migration Tool
Edit
Did you get the same error after restarting the dev server?