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I’m getting the following error
Fatal error: Can’t use Function Return value in write context in C: Windows iwpserver htdocs wordpress wp-content themes usagistream index.php on line 17
the index file has this code
<?php
/**
 * theme from 
 * version 1.0
 */
get_header(); ?>
    <?php
    if (is_front_page() and is_home() ):
    if(!empty(get_option('config_infoweb'))){
    echo '<div id="site-info">';
    echo '<p>',get_option('config_infoweb'),'</p>';
    echo '</div>';
    }
    endif;
    ?>
    <?php if (is_front_page() and is_home() ):  echo '<h3 class="main-title">Recent Post</h3>'; endif;?>
    <section class="page-index site-index row-flex row">
    <?php
        if ( have_posts() ) :
            // Start the Loop.
        while ( have_posts() ) : the_post();
            /*
             * Include the post format-specific template for the content. If you want to
             * use this in a child theme, then include a file called called content-___.php
             * (where ___ is the post format) and that will be used instead.
             */
            get_template_part( 'content' );
        endwhile;
        else :
            // If no content, include the "No posts found" template.
            get_template_part( 'content', 'none' );
        endif;
    ?>
    <div class="clear"></div>
    </section>
    <?php
            // Previous/next post navigation.
            numeric_posts_nav();
    ?>
    <?php if(is_front_page() and is_home()) : ?>
    <section class='anime-index'>
    <?php if(is_active_sidebar('main-widget')) : ?>
    <?php dynamic_sidebar( 'main-widget' ); ?>
    <?php elseif ( is_user_logged_in() ): ?>
    <div class="site-error">
        <div class="fa fa-warning"></div>
        <strong>No Widgets Assigned.</strong>
        <a href="<?php echo admin_url(); ?>widgets.php" class="btn btn-round">Go to Widgets</a>
    </div>
    <?php endif; ?>
    </section>
    <?php endif; ?>
<?php
get_sidebar();
get_footer();
?>
php header file
<!DOCTYPE html>
<html <?php language_attributes(); ?> class="no-js">
<head>
    <title><?php wp_title( '|', true, 'right' ); ?></title>
    <meta charset="<?php bloginfo( 'charset' ); ?>">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="profile" href="http://gmpg.org/xfn/11">
    <link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>">
    <?php wp_head(); ?>
</head>
<body <?php body_class(); ?> >
<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/id_ID/sdk.js#xfbml=1&version=v2.8";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
    <div id="header-wrapper" class="container">
    <header id="header" class="site-header" role="banner">
        <div class="site-branding">
            <?php if ( get_theme_mod( 'usagsilabs_logo' ) ) : ?>
            <?php if(is_home() || is_front_page()) {?>
                <h1 id="logo" class="site-logo">
                    <a href='<?php echo esc_url( home_url( '/' ) ); ?>' title='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>' rel='home'>
                        <img src='<?php echo esc_url( get_theme_mod( 'usagsilabs_logo' ) ); ?>' alt='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>'>
                    </a>
                </h1>
            <?php } else { ?>
                <p id="logo" class="site-logo">
                    <a href='<?php echo esc_url( home_url( '/' ) ); ?>' title='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>' rel='home'>
                        <img src='<?php echo esc_url( get_theme_mod( 'usagsilabs_logo' ) ); ?>' alt='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>'>
                    </a>
                </p>
            <?php } ?>
            <?php else : ?>
            <?php if(is_home() || is_front_page()) {?>
                <h1 id="blog-title" class="site-title"><a href="<?php echo esc_url(home_url('/')); ?>"><?php bloginfo('name');?></a></h1>
            <?php } else { ?>
                <p id="blog-title" class="site-title"><a href="<?php echo esc_url(home_url('/')); ?>"><?php bloginfo('name');?></a></p>
            <?php } ?>
                <p id="blog-description" class='site-description'><?php echo get_bloginfo('description');?></p>
            <?php endif; ?>
        </div>
    <div class='clear'></div>
    </header><!-- #header -->
    <nav id="site-navigation" class="site-navigation cl" role="navigation">
        <input class='dn' id='mb_put' type='checkbox'/>
        <label class='dn' id='mb_lab'><i class='fa fa-bars'></i> Navigation</label>
        <?php wp_nav_menu( array('theme_location' => 'primary', 'fallback_cb' => 'fallback_menu' ) ); ?>
        <?php usagilabs_search() ?>
        <div class="clear"></div>
    </nav><!-- site-navigation -->
    <div id="recomended">
        <?php usagilabs_recomended() ?>
    </div>
    </div>
    <div id="page" class="hfeed site container">
<div id="content" class="site-content">
    <?php if (is_front_page() and is_home() ): usagilabs_hotupdate(); endif;?>
    <main id="main" class="site-main col-md-8 col-sm-8 col-xs-12 col-mb-12" role="main">
Thanks for the reply, but now appeared part of the theme with the following error, Fatal error: Call to Undefined Function usagilabs_search() in iwpserver htdocs wordpress wp-content themes usagistream header.php on line 107
– Endou
php header file is attached in edited post
– Endou