The error that I keep getting is:

module.js:340
    throw err;
          ^
Error: Cannot find module 'stratum-pool'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object. (/opt/stratum-server/server.js:11:15)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)

This is after I enter, node server.js to run the server.  I already configured the server.js file, but get that error.  Thank you.