sh: yarn: command not found when running in development mode

[ibantoo]

my cron is something like this:

every 2.minutes do
  rake "do:something"
end

when my cron run and i see log sh: yarn: command not found, To disable this check, please change check_yarn_integritytofalse in your webpacker config file (config/webpacker.yml).,
when i disable that, it was working, but that is not recommended to do so
how to solve this??