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Cannot add category

Cannot add category

I am having trouble adding a category. This is a new Magento 2.0.13 install with a theme installed. When I navigate to Products>Categories it loads the Default Category. When I click to add either a subcategory or a new root category, it simply reloads the default category. If I navigate to the catalog and attempt add a product and add a new category within that form, I receive the "The value of attribute "is_new" must be set" message. I changed the is_new to be no longer required in the eav_attribute table. I changed permissions in the root with

find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;

I then ran each of these commands

php bin/magento indexer:reindex 
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy

I am still running into the same issue. The browser console shows

Expected to start loader but did not find one in the dom


The network traffic shows a request of 1?isAjax=true with a response of 

Fatal error: Call to undefined method \Override\Controller\Adminhtml\Category\Add\Interceptor::ajaxRequestResponse() in /app/code/Plazathemes/Override/Controller/Adminhtml/Category/Add.php on line 49 


I am a PHP developer but new to Magento. Any help would be appreciated. Please let me know if there is any more info that would help. Thank you