Uncaught Zend_Cache_Exception: Datas must be string or set automatic_serialization = true

Questions
1

SilverStripe Version : 3.6

I have created a new page type and after clicking save and publish screen goes blank.
It is not able to publish the page. I have found following error in my logs.

Error at framework/thirdparty/Zend/Cache.php line 209: Uncaught Zend_Cache_Exception: our Datas must be string or set automatic_serialization = true

Please let me know if anyone have solution for this issue.

2

Can you provide some code, for example the page class you created?