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infoWordPress Core•apiREST APIhourglass_bottomloading-issuecodeJavaScriptextensionplugin•labelCommon•warningModerate

Block editor cannot be loaded

The block editor fails to load when WordPress cannot render the Gutenberg interface. This happens because core scripts receive an invalid response or are blocked by a plugin or theme. The error stops the editor from initializing, leaving a blank screen or an error message.

Symptoms

[dashicons-warning]
Blank white screen
Clicking Edit shows only a loading spinner and no blocks.
[dashicons-warning]
Error message in admin bar
Message reads "Block editor cannot be loaded".
[dashicons-warning]
Block error pop‑up
Popup states "Block has encountered an error".

Common Causes

Classic Editor plugin enabled
Plugin disables Gutenberg and forces the classic editor.
JavaScript errors from theme or plugin
Conflicting scripts prevent core blocks from loading.
Invalid JSON response
Mis‑configured site URL or SSL issue returns malformed data.
Out‑of‑date WordPress core
Older core version lacks required Gutenberg updates.
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