unable to read root page from file:WiredTiger.wt

I shutdown my computer without mongo shutdown. when I startup mongo, I got this error, please help me:

2016-05-18T11:23:44.259+0800 I CONTROL [initandlisten] MongoDB starting : pid=1089 port=27017 dbpath=./db 64-bit host=chencongs-MacBook-Air.local

2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] db version v3.2.5

2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] git version: 34e65e5383f7ea1726332cb175b73077ec4a1b02

2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] allocator: system 2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] modules: none 2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] build environment: 2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] distarch: x86_64 2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] target_arch: x86_64 2016-05-18T11:23:44.260+0800 I CONTROL [initandlisten] options: { storage: { dbPath: "./db" } } 2016-05-18T11:23:44.261+0800 I - [initandlisten] Detected data files in ./db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.

2016-05-18T11:23:44.261+0800 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=4G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=joual,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),

2016-05-18T11:23:44.269+0800 E STORAGE [initandlisten] WiredTiger (-31802) [1463541824:269808][1089:0x7fff76e3a000], file:WiredTiger.wt, connection: unable to read root page from file:WiredTiger.wt: WT_ERROR: non-specific WiredTiger error

2016-05-18T11:23:44.269+0800 E STORAGE [initandlisten] WiredTiger (0) [1463541824:269889][1089:0x7fff76e3a000], file:WiredTiger.wt, connection: WiredTiger has failed to open its metadata

2016-05-18T11:23:44.269+0800 E STORAGE [initandlisten] WiredTiger (0) [1463541824:269923][1089:0x7fff76e3a000], file:WiredTiger.wt, connection: This may be due to the database files being encrypted, being from an older version or due to corruption on disk

2016-05-18T11:23:44.270+0800 E STORAGE [initandlisten] WiredTiger (0) [1463541824:270019][1089:0x7fff76e3a000], file:WiredTiger.wt, connection: You should confirm that you have opened the database with the correct options including all encryption and compression options

2016-05-18T11:23:44.280+0800 I - [initandlisten] Assertion: 28595:-31802: WT_ERROR: non-specific WiredTiger error 2016-05-18T11:23:44.284+0800 I STORAGE [initandlisten] exception in initAndListen: 28595 -31802: WT_ERROR: non-specific WiredTiger error, terminating 2016-05-18T11:23:44.284+0800 I CONTROL [initandlisten] dbexit: rc: 100

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