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I managed to solve this issue by switching from PHP version 5.5 to version 5.4


The warning is regarding the following part of your code: __( ). In WP __ is actually a function for translation purposes. From a short look in the manual, we can see that the __() function usage is: <?php $translated_text = __( $text, $domain ); ?> And that the $text parameter is required. $text (string) (required) Text to translate. ...

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