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Fatal error: Uncaught Error: Call to undefined function add_action() in /home/refref/public_html/knowhow-20250417031118/framework/widgets/widget-custom-cats.php:4 Stack trace: #0 {main} thrown in /home/refref/public_html/knowhow-20250417031118/framework/widgets/widget-custom-cats.php on line 4