Log-stash not showing output in stdout

Elastic Stack Logstash
7

my wonder is , in the output section there is no reference of the input file or its path etc., is it first of all processing or not ? infact when i gave "//" it threw some error

File paths must be absolute, relative path specified: C:\Users\G703065T1\Desktop\log.txt>, :backtrace=>["C:/busapps/drsb/gbl0/logstash/7.0.0/vendor/bundle/jruby/2.5.0/gems/logstash-input-file-4.1.10/lib/logstash/inputs/file.rb:269:in block in register'", "org/jruby/RubyArray.java:1792:in each'", "C:/busapps/drsb/gbl0/logstash/7.0.0/vendor/bundle/jruby/2.5.0/gems/logstash-input-file-4.1.10/lib/logstash/inputs/file.rb:267:in register'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:191:in block in register_plugins'", "org/jruby/RubyArray.java:1792:in each'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:190:in register_plugins'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:280:in start_inputs'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:244:in start_workers'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:145:in run'", "C:/busapps/drsb/gbl0/logstash/7.0.0/logstash-core/lib/logstash/java_pipeline.rb:104:in block in start'"], :thread=>"#<Thread:0x1721e33d run>"}