Page with wordpress return 500

I’m parsing a PHP file to another wordpress and the result say:

Font from origin ‘https://www.myweb.org‘ has been blocked from loading by Cross-Origin Resource Sharing policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘https://www.ayudaenaccion.org.pe‘ is therefore not allowed access. The response had HTTP status code 500.

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And the php that sould be the file have the next php code:

<?php
/*
Template Name: WEB - NameFatherPage - NamePage 
*/
header("Access-Control-Allow-Origin: *");

?>

I searched a solution, and in another places the people say that in wp-config.php i must change define( 'force_SSL', true ); to false. But my site it’s a multysite and i only have a wp-config.php.

How can solve the problem?