Sitecore The “placeholder” placeholder was not rendered in the “page” item

Do you get this error in Sitecore 9?

9952 2018:10:23 12:56:42 WARN The “xxxxx” placeholder was not rendered in the “xxxxx” item ({00000000-0000-0000-0000-000000000000}) rendering context.
Possible causes:​
1) Rendering markup was taken from HTML cache, thus no rendering process took place, and diagnostic message can be safely ignored;​
2) Rendering markup was not rendered due to no parent placeholder was found – item rendering settings should be checked;​
You can control the presence of these messages via ‘Rendering.TraceUnusedRenderings’ Sitecore Configuration setting.

Sitecore 9 have upped the tracing of invalid renderings to allow you to clean up the renderings placed in placeholders that do no longer exist. However if you prefer this message in the development environment and not in the production environment, you can mute the message with the following setting:

<setting name="Rendering.TraceUnusedRenderings" value="false" />

MORE TO READ:

• Using patch files to customize the Sitecore configuration by Sitecore
• Sitecore 9 : Config Patches – Layers & Roles by Jammykam

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