# npm run build

> xo-server@4.6.0 build /root/xo-server
> gulp build --production

module.js:338
    throw err;
    ^

Error: Cannot find module 'gulp-sourcemaps'
  at Function.Module._resolveFilename (module.js:336:15)
  at Function.Module._load (module.js:286:25)
  at Module.require (module.js:365:17)
  at require (module.js:384:17)
  at Object.<anonymous> (/root/xo-server/gulpfile.js:10:18)
  at Module._compile (module.js:434:26)
  at Object.Module._extensions..js (module.js:452:10)
  at Module.load (module.js:355:32)
  at Function.Module._load (module.js:310:12)
  at Module.require (module.js:365:17)
  at require (module.js:384:17)
  at Liftoff.handleArguments (/root/xo-server/node_modules/gulp/bin/gulp.js:116:3)
  at Liftoff.<anonymous> (/root/xo-server/node_modules/gulp/node_modules/liftoff/index.js:192:16)
  at module.exports (/root/xo-server/node_modules/gulp/node_modules/liftoff/node_modules/flagged-respawn/index.js:17:3)
  at Liftoff.<anonymous> (/root/xo-server/node_modules/gulp/node_modules/liftoff/index.js:185:9)
  at /root/xo-server/node_modules/gulp/node_modules/liftoff/index.js:159:9
  at /root/xo-server/node_modules/gulp/node_modules/v8flags/index.js:99:14
  at /root/xo-server/node_modules/gulp/node_modules/v8flags/index.js:38:7
  at doNTCallback0 (node.js:407:9)
  at process._tickCallback (node.js:336:13)
  at Function.Module.runMain (module.js:477:11)
  at startup (node.js:117:18)
  at node.js:951:3


npm ERR! Linux 2.6.32-504.8.1.el6.x86_64
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "build"
npm ERR! node v4.0.0
npm ERR! npm  v2.14.2
npm ERR! code ELIFECYCLE
npm ERR! xo-server@4.6.0 build: `gulp build --production`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the xo-server@4.6.0 build script 'gulp build --production'.
npm ERR! This is most likely a problem with the xo-server package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     gulp build --production
npm ERR! You can get their info via:
npm ERR!     npm owner ls xo-server
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /root/xo-server/npm-debug.log