Craft 2: Exception: CException: Alias "ext.alpha" is invalid Today I updated my craft to latest version Craft V 2.6.3015 by following this url.

I got it updated successfully and now my Craft version is 2.6.3015 which is latest of Craft 2.

After updating the Craft setup, I tested the site, and one of the page is giving an exception as mentioned below:


  Exception thrown in Make a Payment. Exception: CException: Alias "ext.alpha" is >invalid. Make sure it points to an existing PHP file and the file is readable. in C:\path\craft\app\framework\YiiBase.php:324


Please help me to get rid of the error.  I checked that the Craft is not having any extension named alpha.

Stack trace:

#0 C:\path\craft\app\framework\validators\CValidator.php(174): YiiBase::import('ext.alpha', true)
#1 C:\path\craft\app\framework\base\CModel.php(287): CValidator::createValidator('ext.alpha', Object(Craft\BarclaycardEpdq_PaymentModel), Array, Array)
&gt;#2 C:\path\craft\app\framework\base\CModel.php(260): CModel-&gt;createValidators()
&gt;#3 C:\path\craft\app\framework\base\CModel.php(158): CModel-&gt;getValidators()
&gt;#4 C:\path\craft\app\models\BaseModel.php(501): CModel-&gt;validate(NULL, true)
&gt;#5 C:\path\craft\plugins\barclaycardepdq\services\BarclaycardEpdq_ApiService.php(213): Craft\BaseModel-&gt;validate()
&gt;#6 C:\path\craft\plugins\barclaycardepdq\services\BarclaycardEpdq_ApiService.php(64): Craft\BarclaycardEpdq_ApiService-&gt;callBarclaycard('Craft\\Barclayca...', Array, 'https://site...', 'payByAlias')
&gt;#7 C:\path\craft\plugins\rhp\controllers\Rhp_PaymentsController.php(129): Craft\BarclaycardEpdq_ApiService-&gt;makePaymentByAlias(Array)
&gt;#8 C:\path\craft\app\framework\web\actions\CInlineAction.php(49): Craft\Rhp_PaymentsController-&gt;actionMakeAPayment()
&gt;#9 C:\path\craft\app\framework\web\CController.php(308): CInlineAction-&gt;runWithParams(Array)
&gt;#10 C:\path\craft\app\framework\web\CController.php(286): CController-&gt;runAction(Object(CInlineAction))
&gt;#11 C:\path\craft\app\framework\web\CController.php(265): CController-&gt;runActionWithFilters(Object(CInlineAction), Array)
&gt;#12 C:\path\craft\app\framework\web\CWebApplication.php(282): CController-&gt;run('makeAPayment')
&gt;#13 C:\path\craft\app\etc\web\WebApp.php(836): CWebApplication-&gt;runController('rhp/payments/ma...')
&gt;#14 C:\path\craft\app\etc\web\WebApp.php(287): Craft\WebApp-&gt;_processActionRequest()
&gt;#15 C:\path\craft\app\framework\base\CApplication.php(185): Craft\WebApp-&gt;processRequest()
&gt;#16 C:\path\craft\app\index.php(73): CApplication-&gt;run()
&gt;#17 C:\path\index.php(13): require_once('C:\\path\\...')
&gt;#18 {main}
Please download below extension and put alpha.php file in your craft extension folder:
https://www.yiiframework.com/extension/alpha

Best of luck..!!