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infoWordPress Core•codePHPwebwordpressfolderfilesystemsystem_updateUpdatedangerousfatal_error•star_halfUncommon•warningModerate

Fatal error: Uncaught Error: Class ‘WP_Block_Type_Registry’ not found

WordPress tries to load WP_Block_Type_Registry during core bootstrap. If the file class-wp-block-type-registry.php is missing or corrupted the autoloader fails and PHP throws a fatal error.

The error appears before plugins or themes load, so the site stops at the white screen. It usually indicates an incomplete update or a manual removal of core files.

Symptoms

[dashicons-warning]
White screen of death
Site shows a blank page or technical difficulties message
[dashicons-warning]
Fatal error page
PHP displays "Fatal error: Uncaught Error: Class 'WP_Block_Type_Registry' not found"
[dashicons-admin-generic]
Admin inaccessible
Dashboard never loads, any request aborts early

Common Causes

Missing core file
class-wp-block-type-registry.php is absent or corrupted
Failed update
Partial upgrade leaves core files out of place
Wrong WordPress version
Site runs a version older than 5.0 where the class does not exist
PHP version incompatibility
Older PHP versions break the autoloader for newer core files
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