Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending model changes to a code-based migration or enable automatic migration. Set DbMigrationsConfiguration.AutomaticMigrationsEnabled to true to enable automatic migration. You can use the Add-Migration command to write the pending model changes to a code-based migration.
This message results from having unapplied pending migrations to your code first data model (and have disable automatic migrations). Run “Add-Migration” then “Update-Database” and you should be back up and running.