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Fatal error: require(): Failed opening required 'C:\phpstudy_pro\xibaipo/wp-includes/class-walker-category-dropdown.php' (include_path='.;C:\php\pear') in C:\phpstudy_pro\xibaipo\wp-settings.php on line 225

Fatal error: Uncaught Error: Call to a member function set() on null in C:\phpstudy_pro\xibaipo\wp-includes\l10n.php:857 Stack trace: #0 C:\phpstudy_pro\xibaipo\wp-includes\l10n.php(960): load_textdomain() #1 C:\phpstudy_pro\xibaipo\wp-includes\class-wp-fatal-error-handler.php(49): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in C:\phpstudy_pro\xibaipo\wp-includes\l10n.php on line 857