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Is there any way to fix the call_user_func_array error?

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How can I fix this?

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘hammy_add_page’ not found or invalid function name in /home/a4jp/agreatdream.com/public_html/wp-includes/class-wp-hook.php on line 298


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