I do not know how to explain it

[rambo-panda]

there's my system:
Linux AY130708201113505828Z 3.2.0-65-generic #98-Ubuntu SMP Wed Jun 11 20:27:07 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

there's my node_version:
v0.10.32

there;s my npm_version:
1.4.28

there's is my test file: // l know it is a error file
var Validr = require('Validr');

can't find model Validr;

but the test file in my mac is ok!!!!!!!!!

[samora]

var Validr = require('validr'); // lowercase not capitalized

@rambo-panda require('validr') not require('Validr').