我正在安装 Cassanrda-web ，但当我运行命令时“ cassandra-web --hosts '127.0.0.1' --port '9042' “这给了我一个错误，我安装的精算师 cassandra 与 datastax 没有设置用户名和密码，但即使我用 username and password 如果为空，则发生相同的错误。这是错误日志。

Traceback (most recent call last):
     11: from C:/Ruby25-x64/bin/cassandra-web:23:in `<main>'
     10: from C:/Ruby25-x64/bin/cassandra-web:23:in `load'
      9: from C:/Ruby25-x64/bin/gems/cassandra-web-0.4.0/bin/cassandra-web:104:in `<top (required)>'
      8: from C:/Ruby25-x64/bin/gems/cassandra-web-0.4.0/bin/cassandra-web:78:in `run'
      7: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra.rb:296:in `cluster'
      6: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra.rb:306:in `cluster_async'
      5: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra.rb:464:in `validate_and_massage_options'
      4: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra.rb:464:in `new'
      3: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra/compression/compressors/lz4.rb:42:in `initialize'
      2: from C:/Ruby25-x64/bin/gems/cassandra-driver-3.2.3/lib/cassandra/compression/compressors/lz4.rb:42:in `require'
      1: from C:/Ruby25-x64/bin/gems/lz4-ruby-0.3.3/lib/lz4-ruby.rb:4:in `<top (required)>'
C:/Ruby25-x64/bin/gems/lz4-ruby-0.3.3/lib/lz4-ruby.rb:4:in `require': LZ4 support requires the "lz4-ruby" gem: cannot load such file -- 2.5/lz4ruby.so (LoadError)