ActiveRecord::ConcurrentMigrationError:

Cannot run migrations because another migration process is currently running.

richiethomas=# c re_app_development
psql (9.6.11, server 11.2)
WARNING: psql major version 9.6, server major version 11.
         Some psql features might not work.
You are now connected to database "re_app_development" as user "richiethomas".

re_app_development=# SELECT DISTINCT age(now(), query_start) AS age, pg_stat_activity.pid,pg_locks.granted,pg_stat_activity.application_name,pg_stat_activity.backend_start, pg_stat_activity.xact_start, pg_stat_activity.state_change, pg_stat_activity.waiting, pg_stat_activity.state, pg_stat_activity.query_start, left(pg_stat_activity.query, 60)
re_app_development-#     FROM pg_stat_activity, pg_locks
re_app_development-#     WHERE pg_locks.pid = pg_stat_activity.pid
re_app_development-#

re_app_development-# dt
                   List of relations
 Schema |          Name          | Type  |    Owner
--------+------------------------+-------+--------------
 public | ar_internal_metadata   | table | richiethomas
 public | flipper_features       | table | richiethomas
 public | flipper_gates          | table | richiethomas
 public | schema_migrations      | table | richiethomas

 public | reports                | table | richiethomas
 public | users                  | table | richiethomas
 public | categories             | table | richiethomas
 public | responses              | table | richiethomas
 public | zip_code_hpis          | table | richiethomas
 public | zip_codes              | table | richiethomas
(13 rows)

WARNING: psql major version 9.6, server major version 11.
         Some psql features might not work.