bin/build fails

[alantliang]

When running bin/build, I get the following error message:

  lib/mix_deploy_example/release_tasks/migrate.ex:35: MixDeployExample.ReleaseTasks.Migrate.run/1


== Compilation error in file lib/mix_deploy_example/release_tasks/migrate.ex ==
** (CompileError) lib/mix_deploy_example/release_tasks/migrate.ex:35: undefined function config/0
    (elixir) src/elixir_locals.erl:98: :elixir_locals."-ensure_no_undefined_local/3-lc$^0/1-0-"/2
    (elixir) src/elixir_locals.erl:98: anonymous fn/3 in :elixir_locals.ensure_no_undefined_local/3
    (stdlib) erl_eval.erl:680: :erl_eval.do_apply/6

Checking the code, config does not seem to be matched to anything