preload fonts in functions.php

hello i preload some fonts in the front page but it says me Cannot redeclare function insect_font. can you help me ?

thanks a lot .

/*preload*/
add_filter(‘autoptimize_filter_extra_tobepreloaded’, ‘insect_font’);
function insect_font($preloads) {
if ( is_front_page() ) {
$preloads[]=’/wp-content/uploads/revslider/gfonts/poppins/poppins-700.woff2′;
$preloads[]=’/wp-content/uploads/revslider/gfonts/poppins/poppins-600.woff2′;
}
return $preloads;
}

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