Wordpress: call_user_func_array expects parameter 1 to be a valid callback (2 Solutions!!)

Wordpress: call_user_func_array expects parameter 1 to be a valid callback (2 Solutions!!)

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How to hide latest wordpress 5.9 update - Warning: call_user_func_array() expects parameter 1
How to hide latest wordpress 5.9 update - Warning: call_user_func_array() expects parameter 1
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