NameError: uninitialized constant Opener::Core::ResourceSwitcher

[mewlabs]

I installed it and other OpeNER modules using gem, like:

gem install opener-polarity-tagger

Building native extensions. This could take a while...
Successfully installed opener-polarity-tagger-3.5.5
1 gem installed

But when I'm trying to run server it returns error:

./polarity-tagger-server -p 9003

/usr/local/rvm/gems/jruby-9.2.9.0/gems/rollbar-3.4.0/lib/rollbar/json.rb:8: warning: attribute accessor as module_function
NameError: uninitialized constant Opener::Core::ResourceSwitcher
const_missing at org/jruby/RubyModule.java:3747

at /usr/local/rvm/gems/jruby-9.2.9.0/gems/opener-polarity-tagger-3.5.5/bin/polarity-tagger-server:6
load at org/jruby/RubyKernel.java:1013
at ./polarity-tagger-server:23
eval at org/jruby/RubyKernel.java:1052
at /usr/local/rvm/gems/jruby-9.2.9.0/bin/jruby_executable_hooks:22

other modules works well in server mode. How to fix this?

[mewlabs]

had to downgrade opener-core from 2.5 to 2.4 for fix this issue:

gem install opener-core -v 2.4.0
gem uninstall opener-core -v 2.5.0