Mongo not working - cant connect

I ve installed mongo and it was working fine but at some point the daemon was down and if i try to call mongod that’s the output

2017-04-01T15:53:37.396+0000 I CONTROL  [initandlisten] MongoDB starting : pid=19715 port=27017 dbpath=/data/db 64-bit host=nodejs-512mb-fra1-01
2017-04-01T15:53:37.396+0000 I CONTROL  [initandlisten] db version v3.4.2
2017-04-01T15:53:37.396+0000 I CONTROL  [initandlisten] git version: 3f76e40c105fc223b3e5aac3e20dcd026b83b38b
2017-04-01T15:53:37.396+0000 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten] allocator: tcmalloc
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten] modules: none
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten] build environment:
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten]     distmod: ubuntu1604
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten]     distarch: x86_64
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten]     target_arch: x86_64
2017-04-01T15:53:37.397+0000 I CONTROL  [initandlisten] options: {}
2017-04-01T15:53:37.468+0000 I -        [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2017-04-01T15:53:37.469+0000 I STORAGE  [initandlisten] 
2017-04-01T15:53:37.469+0000 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2017-04-01T15:53:37.469+0000 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2017-04-01T15:53:37.469+0000 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=256M,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),
2017-04-01T15:53:37.470+0000 E STORAGE  [initandlisten] WiredTiger error (13) [1491062017:470581][19715:0x7f5a7da3ccc0], wiredtiger_open: /data/db/WiredTiger.lock: handle-open: open: Permission denied
2017-04-01T15:53:37.471+0000 I -        [initandlisten] Assertion: 28595:13: Permission denied src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 267
2017-04-01T15:53:37.478+0000 I STORAGE  [initandlisten] exception in initAndListen: 28595 13: Permission denied, terminating
2017-04-01T15:53:37.478+0000 I NETWORK  [initandlisten] shutdown: going to close listening sockets...
2017-04-01T15:53:37.478+0000 I NETWORK  [initandlisten] removing socket file: /tmp/mongodb-27017.sock
2017-04-01T15:53:37.478+0000 I NETWORK  [initandlisten] shutdown: going to flush diaglog...
2017-04-01T15:53:37.479+0000 I CONTROL  [initandlisten] now exiting
2017-04-01T15:53:37.479+0000 I CONTROL  [initandlisten] shutting down with code:100