capistrano+unicorn+nginxを使ってポートフォリオのデプロイをしようとしたのですが、うまくいかずアドバイスをいただきたく投稿させていただきました。

試したこと
unicornをkillコマンドにて停止させた後にbundle exec cap production deployを実行してデプロイを試みましたが下記のエラーが出ました

#ターミナル
00:14 unicorn:start
      01 $HOME/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/mytask2/current/config/unicorn.rb -E deployment -D 
      01 master failed to start, check stderr log for details
#<Thread:0x00007fe9ab339ba8@/Users/morinaka/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:10 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
	1: from /Users/morinaka/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:11:in `block (2 levels) in execute'
/Users/morinaka/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:15:in `rescue in block (2 levels) in execute': Exception while executing as ec2-user@13.112.251.194: bundle exit status: 1 (SSHKit::Runner::ExecuteError)
bundle stdout: Nothing written
bundle stderr: master failed to start, check stderr log for details
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as ec2-user@13.112.251.194: bundle exit status: 1
bundle stdout: Nothing written
bundle stderr: master failed to start, check stderr log for details


Caused by:
SSHKit::Command::Failed: bundle exit status: 1
bundle stdout: Nothing written
bundle stderr: master failed to start, check stderr log for details

Tasks: TOP => unicorn:start
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as ec2-user@13.112.251.194: bundle exit status: 1
bundle stdout: Nothing written
bundle stderr: master failed to start, check stderr log for details


** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:


 DEBUG [326ed4f8] Finished in 0.081 seconds with exit status 0 (successful).

  INFO [dddcb214] Running $HOME/.rbenv/bin/rbenv exec bundle exec rake db:migrate as ec2-user@13.112.251.194

 DEBUG [dddcb214] Command: cd /var/www/mytask2/releases/20200402102710 && ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" RAILS_ENV="production" ; $HOME/.rbenv/bin/rbenv exec bundle exec rake db:migrate )

  INFO [dddcb214] Finished in 2.051 seconds with exit status 0 (successful).

  INFO [aef75dc9] Running /usr/bin/env ln -s /var/www/mytask2/releases/20200402102710 /var/www/mytask2/releases/current as ec2-user@13.112.251.194

 DEBUG [aef75dc9] Command: ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" ; /usr/bin/env ln -s /var/www/mytask2/releases/20200402102710 /var/www/mytask2/releases/current )

  INFO [aef75dc9] Finished in 0.084 seconds with exit status 0 (successful).

  INFO [c727580e] Running /usr/bin/env mv /var/www/mytask2/releases/current /var/www/mytask2 as ec2-user@13.112.251.194

 DEBUG [c727580e] Command: ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" ; /usr/bin/env mv /var/www/mytask2/releases/current /var/www/mytask2 )

  INFO [c727580e] Finished in 0.083 seconds with exit status 0 (successful).

 DEBUG [b86fdf5c] Running if test ! -d /var/www/mytask2/current; then echo "Directory does not exist '/var/www/mytask2/current'" 1>&2; false; fi as ec2-user@13.112.251.194

 DEBUG [b86fdf5c] Command: if test ! -d /var/www/mytask2/current; then echo "Directory does not exist '/var/www/mytask2/current'" 1>&2; false; fi

 DEBUG [b86fdf5c] Finished in 0.082 seconds with exit status 0 (successful).

 DEBUG [7ba878d6] Running [ -e /var/www/mytask2/shared/tmp/pids/unicorn.pid ] && kill -0 `cat /var/www/mytask2/shared/tmp/pids/unicorn.pid` as ec2-user@13.112.251.194

 DEBUG [7ba878d6] Command: [ -e /var/www/mytask2/shared/tmp/pids/unicorn.pid ] && kill -0 `cat /var/www/mytask2/shared/tmp/pids/unicorn.pid`

 DEBUG [7ba878d6] 	bash: 0 行: kill: (7167) - そのようなプロセスはありません

 DEBUG [7ba878d6] Finished in 0.085 seconds with exit status 1 (failed).

  INFO [e24b778f] Running $HOME/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/mytask2/current/config/unicorn.rb -E deployment -D  as ec2-user@13.112.251.194

 DEBUG [e24b778f] Command: cd /var/www/mytask2/current && ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" RAILS_ENV="production" ; $HOME/.rbenv/bin/rbenv exec bundle exec unicorn -c /var/www/mytask2/current/config/unicorn.rb -E deployment -D  )

 DEBUG [e24b778f] 	master failed to start, check stderr log for details