Cannot start logstash after adding netflow module

When i modify the logstash.yml to add netflow module my logstash never starts and gives below error" [logstash.agent ] Failed to execute action {:action=>LogStash::PipelineAction::Stop/pipeline_id:main, :exception=>"NoMethodError", :message=>"undefined method map' for nil:NilClass\nDid you mean? tap", :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/util.rb:40:inthread_info'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:662:in `block in plugin_threads_info". i am using the instructions as specified here except the port has been changed

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