Note that a leading slash in the path variable can also trigger this error:
$this->view->addHelperPath('/My/Helper/', 'My_Helper'); //error
$this->view->addHelperPath('My/Helper/', 'My_Helper'); //valid
This can get confusing as the
http://framework.zend.com/manual/en/zend.view.helpers.html documentation
provides examples with the leading slash:
// Add /path/to/some/helpers with class prefix 'My_View_Helper'
$view->addHelperPath('/path/to/some/helpers', 'My_View_Helper');
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