My rails app has become unable to redeploy due to 'swapon failed'

I tried to redeploy the Rails app that was working until yesterday, but it stopped working. The error message is as follows.

  echo 10 > /proc/sys/vm/swappiness
  swapon /swapfile
  swapon: /swapfile: swapon failed: Invalid argument
  rails aborted!
  Command failed with status (255): [swapon /swapfile...]

I added a code to fly.toml, “swap_size_mb = 512”, but the app don’t work.
where is the problem?

Added rails

Hi… You have to also locate and remove the swapon commands, since those are no longer valid.

Do you have a file named docker-entrypoint?

Thank you for your kind message.
I cannot fide the file, but I found a code “swapon/swapfile” in fly.rake.

  task :server => :swapfile do
    sh 'bin/rails server'

  task :swapfile do
    sh 'fallocate -l 512M /swapfile'
    sh 'chmod 0600 /swapfile'
    sh 'mkswap /swapfile'
    sh 'echo 10 > /proc/sys/vm/swappiness'
    sh 'swapon /swapfile'

Would it be better to fix this code?

Yes, this does look like the right place…

None of the commands in task :swapfile are needed, now that you have your fly.toml setting.

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Thank you for very good advice!
I was able to deploy after modifying the code as follows.

  task :server do
    sh 'bin/rails server'
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