Logstash input plugin errors

[Ondro_Tadanai]

Hi all, i am developing logstash input plugin which will scrape data from facebook, but i have problems testing it in logstash, with that plugin, logstash fail to run, my config:

input { 
    fb-scrape {
       limit => "100"
       page_id => "123456"
       date_file => "dateConfig.conf"
       access_token => "xxxYYYzzz"
    }
}
output {
  stdout { codec => rubydebug }
}

terminal output from logstash:

ondro@ubuntu:/usr/share/logstash/bin$ sudo ./logstash --log.level trace --config.debug -f /etc/logstash/conf.d/logstash.conf
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
Could not find log4j2 configuration at path /usr/share/logstash/config/log4j2.properties. Using default config which logs errors to the console
[ERROR] 2018-01-21 13:52:17.662 [Ruby-0-Thread-1: /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:22] agent - Failed to execute action {:action=>LogStash::PipelineAction::Create/pipeline_id:main, :exception=>"NameError", :message=>"undefined local variable or method 'scrape_1' for #LogStash::Pipeline:0x5afefd31", :backtrace=>["(eval):8:in ''", "org/jruby/RubyKernel.java:994:in 'eval'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:86:in 'initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:171:in 'initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline_action/create.rb:40:in 'execute'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:335:in 'block in converge_state'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:141:in 'with_pipelines'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:332:in 'block in converge_state'", "org/jruby/RubyArray.java:1734:in 'each'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:319:in 'converge_state'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:166:in 'block in converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:141:in 'with_pipelines'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:164:in 'converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:90:in 'execute'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:343:in 'block in execute'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:24:in `block in initialize'"]}

Problem is probably with code of my plugin, because with stdin input logstash works, but how to find out whats wrong? Should i post code of my plugin as well here?
Thanks for any answer and for your time
Ondro