Logstash 6.2.4 failing with template and java error, pls help!

[August_rush]

[2018-05-13T19:56:11,135][ERROR][logstash.outputs.elasticsearch] Failed to install template. {:message=>"Template file '' could not be found!", :class=>"ArgumentError", :backtrace=>["C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/template_manager.rb:31:in `read_template_file'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/template_manager.rb:17:in `get_template'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/template_manager.rb:7:in `install_template'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:96:in `install_template'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:26:in `register'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/output_delegator_strategies/shared.rb:9:in `register'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/output_delegator.rb:42:in `register'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:342:in `register_plugin'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:353:in `block in register_plugins'", "org/jruby/RubyArray.java:1734:in `each'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:353:in `register_plugins'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:730:in `maybe_setup_out_plugins'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:363:in `start_workers'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:290:in `run'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:250:in `block in start'"]}
[2018-05-13T19:56:11,150][INFO ][logstash.outputs.elasticsearch] New Elasticsearch output {:class=>"LogStash::Outputs::ElasticSearch", :hosts=>["//localhost:9200"]}
[2018-05-13T19:56:11,659][INFO ][logstash.pipeline        ] Pipeline started successfully {:pipeline_id=>"main", :thread=>"#<Thread:0x60757f00@C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:247 sleep>"}
[2018-05-13T19:56:11,675][INFO ][logstash.agent           ] Pipelines running {:count=>1, :pipelines=>["main"]}
[2018-05-13T19:56:12,019][FATAL][logstash.runner          ] An unexpected error occurred! {:error=>#<NoMethodError: undefined method `<' for nil:NilClass>, :backtrace=>["C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:222:in `get_event_type'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:47:in `event_action_tuple'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:36:in `block in multi_receive'", "org/jruby/RubyArray.java:2486:in `map'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/vendor/bundle/jruby/2.3.0/gems/logstash-output-elasticsearch-9.1.1-java/lib/logstash/outputs/elasticsearch/common.rb:36:in `multi_receive'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/output_delegator_strategies/shared.rb:13:in `multi_receive'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/output_delegator.rb:49:in `multi_receive'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:477:in `block in output_batch'", "org/jruby/RubyHash.java:1343:in `each'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:476:in `output_batch'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:428:in `worker_loop'", "C:/Users/kswat/Downloads/logstash-6.2.4/logstash-6.2.4/logstash-core/lib/logstash/pipeline.rb:386:in `block in start_workers'"]}
[2018-05-13T19:56:12,065][ERROR][org.logstash.Logstash    ] java.lang.IllegalStateException: org.jruby.exceptions.RaiseException: (SystemExit) exit