cakephp-3.0.0-beta3 Fatal error: Class 'Locale' not found in \cakephp-3.0.0-beta3\vendor\cakephp\cakephp\src\I18n\I18n.php on line 229

I am a novice cakephp user who just downloaded the 3.0.0-beta3 version. 
 I get "Fatal error: Class 'Locale' not found in \cakephp-3.0.0-beta3\vendor\cakephp\cakephp\src\I18n\I18n.php on line 229
when I attempt to access http://localhost/cakephp-3.0.0-beta3

Can anyone give me some simple instructions as to how to resolve this ?

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