Migration is duplicated but it's really not

Question

On a server I have this:

select * from schema_migrations ;
 version | inserted_at 
---------+-------------
(0 rows)

But when I'm running "migrate" in my Phoenix application via edeliver

$ mix edeliver migrate production --verbose

I get this:

response: RPC to '[email protected]' failed: {'EXIT',
                                      {#{'__exception__' => true,
                                         '__struct__' => 'Elixir.Ecto.MigrationError',
                                         message => <<"migrations can't be executed, migration version 20160827023221 is duplicated">>},
                                       [{'Elixir.Ecto.Migrator',
                                         ensure_no_duplication,1,
                                         [{file,"lib/ecto/migrator.ex"},
                                          {line,254}]},
                                        {'Elixir.Ecto.Migrator',migrate,4,
                                         [{file,"lib/ecto/migrator.ex"},
                                          {line,235}]},
                                        {rpc,'-handle_call_call/6-fun-0-',5,
                                         [{file,"rpc.erl"},{line,187}]}]}}

MIGRATE DONE!

Neither do I have 2 files with the same migration number locally.

Answer 1

I had a same kind of problem after renaming the migration file. Deleting generated application files by using 'mix clean' command helped in my case.