rebar3 run output

./_build/default/rel/hello_world/bin/hello_world console
Exec: /usr/local/lib/erlang/erts-10.7.1/bin/erlexec -boot /opt/app/_build/default/rel/hello_world/releases/0.1.0/hello_world -mode embedded -boot_var ERTS_LIB_DIR /usr/local/lib/erlang/lib -config /opt/app/_build/default/rel/hello_world/releases/0.1.0/sys.config -args_file /opt/app/_build/default/rel/hello_world/releases/0.1.0/vm.args -- console
Root: /opt/app/_build/default/rel/hello_world
/opt/app/_build/default/rel/hello_world
Erlang/OTP 22 [erts-10.7.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:30] [hipe]

=CRASH REPORT==== 3-May-2020::13:00:58.045666 ===
  crasher:
    initial call: application_master:init/4
    pid: <0.327.0>
    registered_name: []
    exception exit: {bad_return,
                     {{hello_world@application,start,[normal,[]]},
                      {'EXIT',
                       {undef,
                        [{process@supervisor@rest_for_one,spawn_link,
                          [#Fun<[email protected]>],
                          []},
                         {hello_world@application,start,2,
                          [{file,
                            "/opt/app/gen/src/[email protected]"},
                           {line,13}]},
                         {application_master,start_it_old,4,
                          [{file,"application_master.erl"},{line,277}]}]}}}}
      in function  application_master:init/4 (application_master.erl, line 138)
    ancestors: [<0.326.0>]
    message_queue_len: 1
    messages: [{'EXIT',<0.328.0>,normal}]
    links: [<0.326.0>,<0.274.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 228
  neighbours:

=INFO REPORT==== 3-May-2020::13:00:58.046718 ===
    application: hello_world
    exited: {bad_return,
                {{hello_world@application,start,[normal,[]]},
                 {'EXIT',
                     {undef,
                         [{process@supervisor@rest_for_one,spawn_link,
                              [#Fun<[email protected]>],
                              []},
                          {hello_world@application,start,2,
                              [{file,
                                   "/opt/app/gen/src/[email protected]"},
                               {line,13}]},
                          {application_master,start_it_old,4,
                              [{file,"application_master.erl"},
                               {line,277}]}]}}}}
    type: permanent
{"Kernel pid terminated",application_controller,"{application_start_failure,hello_world,{bad_return,{{hello_world@application,start,[normal,[]]},{'EXIT',{undef,[{process@supervisor@rest_for_one,spawn_link,[#Fun<[email protected]>],[]},{hello_world@application,start,2,[{file,\"/opt/app/gen/src/[email protected]\"},{line,13}]},{application_master,start_it_old,4,[{file,\"application_master.erl\"},{line,277}]}]}}}}}"}
Kernel pid terminated (application_controller) ({application_start_failure,hello_world,{bad_return,{{hello_world@application,start,[normal,[]]},{'EXIT',{undef,[{process@supervisor@rest_for_one,spawn_l

Crash dump is being written to: erl_crash.dump...done