title: How to start Janus WebRTC gateway?
body: <p>I installed successful Janus on /usr/local/lib and I re-configure to start Janus. But when I do <code>sudo janus</code>, I get this error:</p>
  
  <pre><code>/*
  debian@beaglebone:/usr/local/bin$ janus
  ---------------------------------------------------
    Starting Meetecho Janus (WebRTC Gateway) v0.1.0
  ---------------------------------------------------
  
  Checking command line arguments...
  Debug/log level is 4
  Debug/log timestamps are disabled
  Debug/log colors are enabled
  Adding 'vmnet' to the ICE ignore list...
  Using 10.92.200.16 as local IP...
  [WARN] Token based authentication disabled
  Initializing ICE stuff (Full mode, ICE-TCP candidates disabled, IPv6 support disabled)
  ICE handles watchdog started
  TURN REST API backend: (disabled)
  [WARN] Janus is deployed on a private address (10.92.200.16) but you didn't specify any STUN server! Expect trouble if this is supposed to work over the internet and not just in a LAN...
  BUNDLE is NOT going to be forced
  rtcp-mux is NOT going to be forced
  Fingerprint of our certificate: D2:B9:31:8F:DF:24:D8:0E:ED:D2:EF:25:9E:AF:6F:B8:34:AE:53:9C:E6:F3:8F:F2:64:15:FA:E8:7F:53:2D:38
  [WARN] Data Channels support not compiled
  Plugins folder: /usr/local/lib/janus/plugins
  Loading plugin 'libjanus_voicemail.so'...
  JANUS VoiceMail plugin initialized!
  Loading plugin 'libjanus_recordplay.so'...
  JANUS Record&amp;Play plugin initialized!
  Loading plugin 'libjanus_echotest.so'...
  VoiceMail watchdog started
  EchoTest watchdog started
  Record&amp;Play watchdog started
  JANUS EchoTest plugin initialized!
  Loading plugin 'libjanus_videocall.so'...
  JANUS VideoCall plugin initialized!
  Loading plugin 'libjanus_streaming.so'...
  VideoCall watchdog started
  JANUS Streaming plugin initialized!
  Loading plugin 'libjanus_videoroom.so'...
  JANUS VideoRoom plugin initialized!
  Streaming watchdog started
  Loading plugin 'libjanus_audiobridge.so'...
  JANUS AudioBridge plugin initialized!
  VideoRoom watchdog started
  Loading plugin 'libjanus_sip.so'...
  AudioBridge watchdog started
  JANUS SIP plugin initialized!
  Transport plugins folder: /usr/local/lib/janus/transports
  Loading transport plugin 'libjanus_http.so'...
  SIP watchdog started
  [ERR] [janus.c:main:3684]       Couldn't load transport plugin 'libjanus_http.so': libmicrohttpd.so.12: cannot open shared object file: No such file or directory
  [FATAL] [janus.c:main:3741] No Janus API transport is available... enable at least one and restart Janus
  </code></pre>
  
  <p>*/
  libjanus_http.so and libmicrohttpd.so.12 are exist on usr/local/lib/janus/transport  and /usr/local/lib</p>
  
  <p>What does the error mean?</p>