Magento 2 Data key is missing: code-entity

Question

I'm not able to create or edit pages in Magento 2.2.0.

Answer 1

Well this is a notable bug in Magento 2.2.0

This issue arises when you have enabled Google Analytics settings from store configuration and specify the option Enable Content Experiments you will find the same issue.

You can check the same settings and if it enabled you can disable it.

Also, you can look into the fix that has been committed in git source

in vendor/magento/module-google-optimizer/view/adminhtml/ui_component/cms_page_form.xml

Replace this code

<htmlContent name="html_content">
    <block name="googleOptimizerBlockAdminhtmlFormCmsPage" class="Magento\GoogleOptimizer\Block\Adminhtml\Form\CmsPage">
        <arguments>
            <argument name="code-entity" xsi:type="string">Magento\GoogleOptimizer\Block\Adminhtml\Cms\Page\EntityCmsPage</argument>
            <argument name="form-name" xsi:type="string">cms_page_form</argument>
        </arguments>
    </block>
</htmlContent>

Answer 2

It's a bug in your version, try to update or disable the Enable Content Experiments options.