Fatal error: Uncaught Error: Call to a member function process() on boolean in /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Optimisation/Processor.php:67 Stack trace: #0 /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Observer.php(21): Potato_Compressor_Model_Optimisation_Processor->processHtmlResponse(Object(Mage_Core_Controller_Response_Http)) #1 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Model/App.php(1358): Potato_Compressor_Model_Observer->sendResponseBefore(Object(Varien_Event_Observer)) #2 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Potato_Compressor_Model_Observer), 'sendResponseBef...', Object(Varien_Event_Observer)) #3 /var/www/sites/www.rpimaging.com/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('http_response_s...', Array) #4 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Controller/Response/Http.php(83): Mage::dispatchEvent('http_response_s...', A in /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Optimisation/Processor.php on line 67
Array
(
    [type] => 1
    [message] => Uncaught Error: Call to a member function process() on boolean in /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Optimisation/Processor.php:67
Stack trace:
#0 /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Observer.php(21): Potato_Compressor_Model_Optimisation_Processor->processHtmlResponse(Object(Mage_Core_Controller_Response_Http))
#1 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Model/App.php(1358): Potato_Compressor_Model_Observer->sendResponseBefore(Object(Varien_Event_Observer))
#2 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Potato_Compressor_Model_Observer), 'sendResponseBef...', Object(Varien_Event_Observer))
#3 /var/www/sites/www.rpimaging.com/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('http_response_s...', Array)
#4 /var/www/sites/www.rpimaging.com/app/code/core/Mage/Core/Controller/Response/Http.php(83): Mage::dispatchEvent('http_response_s...', A
    [file] => /var/www/sites/www.rpimaging.com/app/code/local/Potato/Compressor/Model/Optimisation/Processor.php
    [line] => 67
)