Can't start my app on a centos7 do server

help
1

Here is the error report

=> Started proxy.                             
=> Started MongoDB.                           
nova:rss: updating npm dependencies -- rss...                                  
Unexpected mongo exit code null. Restarting.  
                                              
/root/.meteor/packages/coffeescript/.1.0.17.1qmihgc++os+web.browser+web.cordova/plugin.compileCoffeescript.os/npm/node_modules/meteor/promise/node_modules/meteor-promise/promise_server.js:116
      throw error;
            ^
Error: spawn ENOMEM
    at errnoException (child_process.js:1011:11)
    at ChildProcess.spawn (child_process.js:958:11)
    at Object.exports.spawn (child_process.js:746:9)
    at spawnMongod (/tools/runners/run-mongo.js:45:24)
    at launchOneMongoAndWaitForReadyForInitiate (/tools/runners/run-mongo.js:468:12)
    at launchMongo (/tools/runners/run-mongo.js:682:7)
    at MongoRunner._startOrRestart (/tools/runners/run-mongo.js:789:19)
    at [object Object].<anonymous> (/tools/runners/run-mongo.js:857:14)
    at runWithEnvironment (/tools/utils/fiber-helpers.js:112:21)
2

Solved. It’s because there’s no swap space in DO server.