This question already has an answer here:
After upgrading from 1.9 to 1.9.2 everything seems to be working fine but when I go to System>Configuration>Configurable Swatches I get the following error:
Fatal error: Call to a member function toOptionArray() on a non-object in app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 463
I tried re-installing admin_html from magento connect but it didn't help and I am sure my theme supports configurable swatches because it's enabled on the demo. Any suggestions on how to solve this problem?