"Warning: call_user_func_array() expects parameter 1 to be a valid callback" Code Answer's
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Warning: call_user_func_array() expects parameter 1 to be a valid callback
Somewhere in your theme or plugins is a line like this:
add_filter( 'something', 'regis_options' );
Could also be add_action(). Find that piece of code and remove or fix it.
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