plugin issue - please help
for some reason I'm getting the below error. Anyone able to help me figure this out? I was trying to add the Nest plugin and then started getting this error.

Error: listen EADDRINUSE :::51826 at Object._errnoException (util.js:1024:11) at _exceptionWithHostPort (util.js:1046:20) at Server.setupListenHandle [as _listen2] (net.js:1351:14) at listenInCluster (net.js:1392:12) at Server.listen (net.js:1476:7) at EventedHTTPServer.listen (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/util/eventedhttp.js:60:19) at HAPServer.listen (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:158:20) at Bridge.Accessory.publish (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:607:16) at Server._publish (/usr/local/lib/node_modules/homebridge/lib/server.js:126:16) at Server.<anonymous> (/usr/local/lib/node_modules/homebridge/lib/server.js:382:14) at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/util/once.js:16:19 at /usr/local/lib/node_modules/homebridge-smartthings/index.js:121:4 at /usr/local/lib/node_modules/homebridge-smartthings/index.js:98:5 at /usr/local/lib/node_modules/homebridge-smartthings/lib/smartthingsapi.js:94:29 at IncomingMessage.<anonymous> (/usr/local/lib/node_modules/homebridge-smartthings/lib/smartthingsapi.js:45:29) at emitNone (events.js:111:20) at IncomingMessage.emit (events.js:208:7) at endReadableNT (_stream_readable.js:1056:12) at _combinedTickCallback (internal/process/next_tick.js:138:11) at process._tickCallback (internal/process/next_tick.js:180:9)