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How to Fix the Block Editor Error: “Updating failed. Error message: The response is not a valid JSON response”

How to Fix the Block Editor Error: “Updating failed. Error message: The response is not a valid JSON response”

This is a dreaded error that sometimes shows up after trying to update or publish a WordPress post or page.

When this error pops up, it’s a bit of a challenge to understand what’s going on since the error is so cryptic and doesn’t provide any concrete cause of the error.

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