Call to a member function put_contents() on a non-object

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Initialize the WP filesystem and no more using file_put_contents function. Try this:

[...]

global $wp_filesystem;
// Initialize the WP filesystem, no more using 'file-put-contents' function
if (empty($wp_filesystem)) {
    require_once (ABSPATH . '/wp-admin/includes/file.php');
    WP_Filesystem();
}

if(!$wp_filesystem->put_contents( $path, $css, 0644) ) {
    return __('Failed to create css file');
}

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