railsサーバが起動できません。

前提・実現したいこと

現場で使えるRuby on rails 5 速習実践ガイドchapter3を参考にアプリケーションのひな型を作成したのですが、一度シャットダウンして次の日にもう一度bin/rails sで立ち上げようとしたら、下記のようなエラーが出ました。

発生している問題・エラーメッセージ

Traceback (most recent call last):
22: from bin/rails:3:in <main>' 21: from bin/rails:3:in load'
20: from /home/kaishi/taskleaf/bin/spring:15:in <top (required)>' 19: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:54:in require'
18: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:54:in require' 17: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in <top (required)>'
16: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in load' 15: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/bin/spring:49:in <top (required)>'
14: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client.rb:30:in run' 13: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in call'
12: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in call' 11: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in load'
10: from /home/kaishi/taskleaf/bin/rails:8:in <top (required)>' 9: from /home/kaishi/taskleaf/bin/rails:8:in require_relative'
8: from /home/kaishi/taskleaf/config/boot.rb:3:in <top (required)>' 7: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:54:in require'
6: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:54:in require' 5: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/setup.rb:9:in <top (required)>'
4: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/setup.rb:12:in rescue in <top (required)>' 3: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/setup.rb:12:in message'
2: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/dsl.rb:574:in to_s' 1: from /home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/dsl.rb:544:in contents'
/home/kaishi/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.0.2/lib/bundler/dsl.rb:544:in `read': Permission denied @ rb_sysopen - /home/kaishi/taskleaf/Gemfile (Errno::EACCES)

該当のソースコード

bin/rails s

試したこと

ユーザー権限がないとのことなので、rbenvのユーザー権限を調べようと思ったのですが、いかんせんwindowsで環境構築している例が少ないようで、対策方法がわからずに途方に暮れてます。
私はまだ始めたばかりの初学者なので、説明の足りていない部分が多々あると思います。遠慮なくご指摘ください。

補足情報（FW/ツールのバージョンなど）

OS:Windows10
ターミナル:wsl

###追記1

total 16
drwxrwxrwx 1 kaishi kaishi 512 Nov 2 11:23 .
drwxr-xr-x 1 kaishi kaishi 512 Nov 2 06:51 ..
drwxrwxrwx 1 kaishi kaishi 512 Nov 2 11:23 .bundle
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 .git
-rw-rw-rw- 1 kaishi kaishi 620 Nov 1 05:54 .gitignore
-rw-rw-rw- 1 kaishi kaishi 5 Nov 1 05:54 .ruby-version
-rw-rw-rw- 1 kaishi kaishi 2266 Nov 1 06:28 Gemfile
-rw-rw-rw- 1 kaishi kaishi 5869 Nov 1 06:31 Gemfile.lock
-rw-rw-rw- 1 kaishi kaishi 374 Nov 1 05:54 README.md
-rw-rw-rw- 1 kaishi kaishi 227 Nov 1 05:54 Rakefile
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 app
drwxr-xr-x 1 kaishi kaishi 512 Nov 1 05:56 bin
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 config
-rw-rw-rw- 1 kaishi kaishi 130 Nov 1 05:54 config.ru
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 db
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 lib
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:58 log
-rw-rw-rw- 1 kaishi kaishi 66 Nov 1 05:54 package.json
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 public
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 storage
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 test
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 06:03 tmp
drwxrwxrwx 1 kaishi kaishi 512 Nov 1 05:54 vendor