2017-12-11 21:02:10 +0900 [info]: Worker 0 finished unexpectedly with status 1
C:\opt\td-agent\embedded\bin\ruby.exe: default_external already set to ascii-8bit (RuntimeError)


for system ruby;s env vars.

C:\opt\td-agent\embedded\lib\ruby\gems\2.3.0\gems\fluentd-0.14.13\lib\fluent\supervisor.rb
```ruby
      rubyopt = ENV["RUBYOPT"]
      fluentd_spawn_cmd = [ServerEngine.ruby_bin_path, "-Eascii-8bit:ascii-8bit"]
      fluentd_spawn_cmd << rubyopt if rubyopt
      fluentd_spawn_cmd << $0
      fluentd_spawn_cmd += $fluentdargv
      fluentd_spawn_cmd << "--under-supervisor"
```

remove "-Eascii-8bit:ascii-8bit"