make on ChicagoBoss failing with escript: exception error: undefined function rebar:main/1

Question

I am trying to install ChicagoBoss based on the instructions here. Now, Make is failing with exception -

=ERROR REPORT==== 14-Dec-2022::11:15:33.605319 ===
beam/beam_load.c(148): Error loading module rebar:
  please re-compile this module with an Erlang/OTP 25 compiler


escript: exception error: undefined function rebar:main/1
  in function  escript:run/2 (escript.erl, line 750)
  in call from escript:start/1 (escript.erl, line 277)
  in call from init:start_em/1 
  in call from init:do_boot/3 
make: *** [compile] Error 127

I have further installed rebar3 using command -

homebrew install rebar3

I am running Erlang OTP/25 in mac. I haven't been able to understand if it's a problem with

rebar3 

or

ChicagoBoss

Answer 1

The problem is with ChicagoBoss. It includes a rebar binary that was compiled with Erlang/OTP release 17, but Erlang/OTP release 25 can only use modules compiled with release 21 or later.

The rebar binary starts with the line #!/usr/bin/env escript, meaning that it looks for escript in the PATH. This picks up release 25, causing this problem. You could try installing release 24 or earlier to work around this.

You might find ASDF useful for switching between Erlang versions: https://github.com/asdf-vm/asdf-erlang