Error while bind

[PluginYML]

root@kvm-4120-12036 ~ # cassandra-web --bind 127.0.0.1:9042
Traceback (most recent call last):
8: from /usr/local/bin/cassandra-web:23:in <main>' 7: from /usr/local/bin/cassandra-web:23:in load'
6: from /var/lib/gems/2.5.0/gems/cassandra-web-0.5.0/bin/cassandra-web:104:in <top (required)>' 5: from /var/lib/gems/2.5.0/gems/cassandra-web-0.5.0/bin/cassandra-web:46:in run'
4: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' 3: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require'
2: from /var/lib/gems/2.5.0/gems/cassandra-web-0.5.0/app.rb:6:in <top (required)>' 1: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require'
/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- bundler/setup (LoadError)
root@kvm-4120-12036 ~ #