Get started, How to run? about crawler HOT 4 CLOSED

crawler:mongo Drop page collection +0ms
(node:130492) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): MongoError: ns not found
(node:130492) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: Redis connection to localhost:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
    at Object._errnoException (util.js:1041:11)
    at _exceptionWithHostPort (util.js:1064:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1153:14)

events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: Redis connection to localhost:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1121:14)
Emitted 'error' event at:
    at RedisClient.on_error (/home/yair/dev/crawler/node_modules/redis/index.js:406:14)
    at Socket.<anonymous> (/home/yair/dev/crawler/node_modules/redis/index.js:279:14)
    at Socket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
    at process.internalTickCallback (internal/process/next_tick.js:72:19)