When i am going to connect mongo it's give me below error :

1. mongo
   MongoDB shell version: 3.2.5
   connecting to: test
   2018-02-26T04:51:31.527+0000 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
   2018-02-26T04:51:31.527+0000 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
   connect@src/mongo/shell/mongo.js:229:14
   @(connect):1:6

exception: connect failed

*After that i am going to repair mongodb by following command :
sudo mongod --dbpath /var/lib/mongodb/ --repair*

1. sudo mongod --dbpath /var/lib/mongodb/ --repair
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] MongoDB starting : pid=30365 port=27017 dbpath=/var/lib/mongodb/ 64-bit host=ip-172-31-0-51
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] db version v3.2.5
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] git version: 34e65e5383f7ea1726332cb175b73077ec4a1b02
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] allocator: tcmalloc
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] modules: none
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] build environment:
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] distmod: ubuntu1404
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] distarch: x86_64
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] target_arch: x86_64
   2018-02-26T04:59:50.459+0000 I CONTROL [initandlisten] options:
   Unknown macro: { repair}

   2018-02-26T04:59:50.481+0000 I - [initandlisten] Detected data files in /var/lib/mongodb/ created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
   2018-02-26T04:59:50.481+0000 I STORAGE [initandlisten] Detected WT journal files. Running recovery from last checkpoint.
   2018-02-26T04:59:50.481+0000 I STORAGE [initandlisten] journal to nojournal transition config: create,cache_size=1G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
   2018-02-26T04:59:50.487+0000 E STORAGE [initandlisten] WiredTiger (0) [1519621190:487846][30365:0x7f5429562cc0], file:WiredTiger.wt, connection: read checksum error for 4096B block at offset 36864: block header checksum of 2260760038 doesn't match expected checksum of 1188426859
   2018-02-26T04:59:50.487+0000 E STORAGE [initandlisten] WiredTiger (0) [1519621190:487937][30365:0x7f5429562cc0], file:WiredTiger.wt, connection: WiredTiger.wt: encountered an illegal file format or internal value
   2018-02-26T04:59:50.487+0000 E STORAGE [initandlisten] WiredTiger (-31804) [1519621190:487973][30365:0x7f5429562cc0], file:WiredTiger.wt, connection: the process must exit and restart: WT_PANIC: WiredTiger library panic
   2018-02-26T04:59:50.488+0000 I - [initandlisten] Fatal Assertion 28558
   2018-02-26T04:59:50.488+0000 I - [initandlisten]

***aborting after fassert() failure

Please suggest me solution for this.
Thanks!