我是新手，实际上是新手。我正在尝试用jruby运行sinatra，下面是我尝试遵循的tutorail，
http://www.ioncannon.net/programming/1325/getting-started-with-jruby-webapps-using-rack-and-sinatra/
我已经相应地安装了所有组件，但下面出现异常。
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.jruby.util.SecurityHelper to field java.lang.reflect.Field.modifiers
WARNING: Please consider reporting this to the maintainers of org.jruby.util.SecurityHelper
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
NoMethodError: undefined method `plain_specs' for #<Bundler::RubygemsIntegration:0x55b62629 @replaced_methods={}>
setup at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/gems/shared/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:84
check at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/gems/shared/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:124
<main> at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/gems/shared/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:131
require at org/jruby/RubyKernel.java:984
(root) at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
require at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:135
<main> at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/gems/shared/gems/rubygems-bundler-1.4.5/lib/rubygems_executable_plugin.rb:4
each at org/jruby/RubyArray.java:1792
run at /home/jahanzeb/.rvm/rubies/jruby-9.2.6.0/lib/ruby/gems/shared/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:50
<main> at /home/jahanzeb/.rvm/gems/jruby-9.2.6.0/bin/jruby_executable_hooks:10
我已经解决了相关问题，但没有结果。 请帮助