Node.js NodeJS:错误：spawn-EINVAL

环境：

代码是从节点单据复制的

出现错误：

[root@etone46备份]节点1.js

child_process.js:790
    throw errnoException(errno, 'spawn');
          ^
Error: spawn EINVAL
    at errnoException (child_process.js:838:11)
    at ChildProcess.spawn (child_process.js:790:11)
    at exports.spawn (child_process.js:614:9)
    at Object.<anonymous> (/opt/backups/1.js:3:14)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

var util  = require('util'),
    spawn = require('child_process').spawn,
        ls    = spawn('ls', ['-lh', '/usr']);

        ls.stdout.on('data', function (data) {
              console.log('stdout: ' + data);
        });

        ls.stderr.on('data', function (data) {
              console.log('stderr: ' + data);
        });

        ls.on('exit', function (code) {
              console.log('child process exited with code ' + code);
        });

child_process.js:790
    throw errnoException(errno, 'spawn');
          ^
Error: spawn EINVAL
    at errnoException (child_process.js:838:11)
    at ChildProcess.spawn (child_process.js:790:11)
    at exports.spawn (child_process.js:614:9)
    at Object.<anonymous> (/opt/backups/1.js:3:14)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)