Error when migrating database using edeliver - mysql

Question

I've always used edeliver to deploy my apps, but on my new app, I'm getting a weird error.
When I run mix edeliver migrate production, I'm getting this response:
EDELIVER MYPROJECT WITH MIGRATE COMMAND
-----> migrateing production servers
production node:
user : user
host : example.com
path : /home/user/app_release
response: RPC to 'myproject#127.0.0.1' failed: {'EXIT',
{#{'__exception__' => true,
'__struct__' =>
'Elixir.ArgumentError',
message => <<"argument error">>},
[{ets,lookup_element,
['Elixir.Ecto.Registry',nil,3],
[]},
{'Elixir.Ecto.Registry',lookup,1,
[{file,"lib/ecto/registry.ex"},
{line,18}]},
{'Elixir.Ecto.Adapters.SQL',sql_call,
6,
[{file,"lib/ecto/adapters/sql.ex"},
{line,251}]},
{'Elixir.Ecto.Adapters.SQL','query!',
5,
[{file,"lib/ecto/adapters/sql.ex"},
{line,198}]},
{'Elixir.Ecto.Adapters.MySQL',
'-execute_ddl/3-fun-0-',4,
[{file,"lib/ecto/adapters/mysql.ex"},
{line,107}]},
{'Elixir.Enum',
'-reduce/3-lists^foldl/2-0-',3,
[{file,"lib/enum.ex"},{line,1826}]},
{'Elixir.Ecto.Adapters.MySQL',
execute_ddl,3,
[{file,"lib/ecto/adapters/mysql.ex"},
{line,107}]},
{'Elixir.Ecto.Migrator',
'-migrated_versions/2-fun-0-',2,
[{file,"lib/ecto/migrator.ex"},
{line,44}]}]}}
But when I type mix edeliver restart production followed by the migration command, everything goes normally. Why is this happening?