Magento Patch 9767 “Decoding failed: Syntax error” [closed]

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I am running EE 1.14.0.1 and PHP 5.6 and got below error on production server only. I cleared the cache and implement the solutions suggested by @folektoras133 at Security Patch SUPEE-9767 - Possible issues?. nothing worked. Any suggestion ?

a:5:{i:0;s:29:"Decoding failed: Syntax error";i:1;s:1397:"#0 //htdoc/app/code/local/Enterprise/PageCache/Model/Observer.php(178): Zend_Json::decode('a:0:{}')
packet_write_wait: Connection to 52.26.63.162 port 22: Broken pipegeCache/Model/logouter.php(214): Enterprise_PageCache_Model_Observer->_loadDesignExceptions()
Saving session.../htdoc/app/code/local/Enterprise/PageCache/Model/...copying shared history...e_PageCache_Model_Observer->_saveDesignException()
...saving history...truncating history files...core/Mage/Core/Model/App.php(1339...completed._PageCache_Model_Observer->cacheResponse(Object(Varien_Event_Observer))
[Process completed]#4 //htdoc/app/code/core/Mage/Core): Mage_Core_Model_App->_callObserverMethod(Object(Enterprise_PageCache_Model_Observer), 'cacheResponse', Object(Varien_Event_Observer))
#5 //htdoc/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_fron...', Array)
#6 //htdoc/app/code/core/Mage/Core/Controller/Varien/Front.php(182): Mage::dispatchEvent('controller_fron...', Array)
#7 //htdoc/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#8 //htdoc/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#9 //htdoc/index.php(90): Mage::run('', 'store')
#10 {main}";s:3:"url";s:161:"/product_page?utm_source=google_shopping&gclid=CjwKEAjwgtTJBRDRmd6ZtLrGyxwSJAA7Fy-hBnSgpddfHXC9mP9HkKPPk3WbbtZfbd7voy-K2NSd5BoC0eLw_wcB";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:7:"default";}

Answer 1

I found the solution. We are using Redis Caching. So I had to disable the default caching on production Magento. Once I did that the site worked fine. Also another thing to be take in consideration we have multiple AWS EC2 instances running on production. but one EC2 instance for development. I am not sure why this would cause the problem but its solved now.

Thanks everyone.