Michael,
you're using Zen Cart 1.5.6c and the contents of the file I asked you to post is from an older version, thus the problems. You should use the file from your Zen Cart version, not an obsolete one.

Here's what you need in that file (I added the Cookie Consent code so you can just copy/paste):
Code:
<?php
/**
 * Common Template - tpl_main_page.php
 *
 * Governs the overall layout of an entire page<br />
 * Normally consisting of a header, left side column. center column. right side column and footer<br />
 * For customizing, this file can be copied to /templates/your_template_dir/pagename<br />
 * example: to override the privacy page<br />
 * - make a directory /templates/my_template/privacy<br />
 * - copy /templates/templates_defaults/common/tpl_main_page.php to /templates/my_template/privacy/tpl_main_page.php<br />
 * <br />
 * to override the global settings and turn off columns un-comment the lines below for the correct column to turn off<br />
 * to turn off the header and/or footer uncomment the lines below<br />
 * Note: header can be disabled in the tpl_header.php<br />
 * Note: footer can be disabled in the tpl_footer.php<br />
 * <br />
 * $flag_disable_header = true;<br />
 * $flag_disable_left = true;<br />
 * $flag_disable_right = true;<br />
 * $flag_disable_footer = true;<br />
 * <br />
 * // example to not display right column on main page when Always Show Categories is OFF<br />
 * <br />
 * if ($current_page_base == 'index' and $cPath == '') {<br />
 *  $flag_disable_right = true;<br />
 * }<br />
 * <br />
 * example to not display right column on main page when Always Show Categories is ON and set to categories_id 3<br />
 * <br />
 * if ($current_page_base == 'index' and $cPath == '' or $cPath == '3') {<br />
 *  $flag_disable_right = true;<br />
 * }<br />
 *
 * @package templateSystem
 * @copyright Copyright 2003-2018 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: rbarbour zcadditions.com Tue May 8 00:42:18 2018 -0400 Modified in v1.5.6 $
 */

/** bof DESIGNER TESTING ONLY: */
// $messageStack->add('header', 'this is a sample error message', 'error');
// $messageStack->add('header', 'this is a sample caution message', 'caution');
// $messageStack->add('header', 'this is a sample success message', 'success');
// $messageStack->add('main', 'this is a sample error message', 'error');
// $messageStack->add('main', 'this is a sample caution message', 'caution');
// $messageStack->add('main', 'this is a sample success message', 'success');
/** eof DESIGNER TESTING ONLY */



// the following IF statement can be duplicated/modified as needed to set additional flags
if (in_array($current_page_base,explode(",",'list_pages_to_skip_all_right_sideboxes_on_here,separated_by_commas,and_no_spaces')) ) {
  $flag_disable_right = true;
}

// ZCAdditions.com, Responsive Template Default (BOF-addition 1 of 1)
if ($flag_disable_right or COLUMN_RIGHT_STATUS == '0') {
  $box_width_right = preg_replace('/[^0-9]/', '', '0');
  $box_width_right_new = '';
} else {
  $box_width_right = COLUMN_WIDTH_RIGHT;
  $box_width_right = preg_replace('/[^0-9]/', '', $box_width_right);
  $box_width_right_new = 'col' . $box_width_right;
}

if ($flag_disable_left or COLUMN_LEFT_STATUS == '0') {
  $box_width_left = preg_replace('/[^0-9]/', '', '0');
  $box_width_left_new = '';
} else {
  $box_width_left = COLUMN_WIDTH_LEFT;
  $box_width_left = preg_replace('/[^0-9]/', '', $box_width_left);
  $box_width_left_new = 'col' . $box_width_left;
}

$side_columns_total = $box_width_left + $box_width_right;
$center_column = '970'; // This value should not be altered
$center_column_width = $center_column - $side_columns_total;
// ZCAdditions.com, Responsive Template Default (EOF-addition 1 of 1)


$header_template = 'tpl_header.php';
$footer_template = 'tpl_footer.php';
$left_column_file = 'column_left.php';
$right_column_file = 'column_right.php';
$body_id = ($this_is_home_page) ? 'indexHome' : str_replace('_', '', $_GET['main_page']);
?>
<body id="<?php echo $body_id . 'Body'; ?>"<?php if($zv_onload !='') echo ' onload="'.$zv_onload.'"'; ?>>

<?php
 if ( $detect->isMobile() && !$detect->isTablet() || $_SESSION['layoutType'] == 'mobile' ) {
  echo '<div id="page">';
 } else if ( $detect->isTablet() || $_SESSION['layoutType'] == 'tablet' ){
  echo '<div id="page">';
  } else {
//
  }
?>

<?php
  if (SHOW_BANNERS_GROUP_SET1 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET1)) {
    if ($banner->RecordCount() > 0) {
?>
<div id="bannerOne" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
?>

<div id="mainWrapper">
<?php
 /**
  * prepares and displays header output
  *
  */
  if (CUSTOMERS_APPROVAL_AUTHORIZATION == 1 && CUSTOMERS_AUTHORIZATION_HEADER_OFF == 'true' and ($_SESSION['customers_authorization'] != 0 or $_SESSION['customer_id'] == '')) {
    $flag_disable_header = true;
  }
  require($template->get_template_dir('tpl_header.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_header.php');?>

<div id="contentMainWrapper">

<?php
if (COLUMN_LEFT_STATUS == 0 || (CUSTOMERS_APPROVAL == '1' and $_SESSION['customer_id'] == '') || (CUSTOMERS_APPROVAL_AUTHORIZATION == 1 && CUSTOMERS_AUTHORIZATION_COLUMN_LEFT_OFF == 'true' and ($_SESSION['customers_authorization'] != 0 or $_SESSION['customer_id'] == ''))) {
  // global disable of column_left
  $flag_disable_left = true;
}
if (!$flag_disable_left) {
?>
  <div class="<?php echo $box_width_left_new; ?>">
<?php
 /**
  * prepares and displays left column sideboxes
  *
  */
  require(DIR_WS_MODULES . zen_get_module_directory('column_left.php'));
?>
  </div>

<?php
}
?>

  <div class="<?php echo 'col' . $center_column_width; ?>">

<!-- bof  breadcrumb -->
<?php if (DEFINE_BREADCRUMB_STATUS == '1' || (DEFINE_BREADCRUMB_STATUS == '2' && !$this_is_home_page) ) { ?>
    <div id="navBreadCrumb"><?php echo $breadcrumb->trail(BREAD_CRUMBS_SEPARATOR); ?></div>
<?php } ?>
<!-- eof breadcrumb -->

<?php
  if (SHOW_BANNERS_GROUP_SET3 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET3)) {
    if ($banner->RecordCount() > 0) {
?>
    <div id="bannerThree" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
?>

<!-- bof upload alerts -->
<?php if ($messageStack->size('upload') > 0) echo $messageStack->output('upload'); ?>
<!-- eof upload alerts -->

<?php
 /**
  * prepares and displays center column
  *
  */
 require($body_code);
?>

<?php
  if (SHOW_BANNERS_GROUP_SET4 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET4)) {
    if ($banner->RecordCount() > 0) {
?>
    <div id="bannerFour" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
?>
  </div>


<?php
//if (COLUMN_RIGHT_STATUS == 0 || (CUSTOMERS_APPROVAL == '1' and $_SESSION['customer_id'] == '') || (CUSTOMERS_APPROVAL_AUTHORIZATION == 1 && CUSTOMERS_AUTHORIZATION_COLUMN_RIGHT_OFF == 'true' && $_SESSION['customers_authorization'] != 0)) {
if (COLUMN_RIGHT_STATUS == 0 || (CUSTOMERS_APPROVAL == '1' and $_SESSION['customer_id'] == '') || (CUSTOMERS_APPROVAL_AUTHORIZATION == 1 && CUSTOMERS_AUTHORIZATION_COLUMN_RIGHT_OFF == 'true' and ($_SESSION['customers_authorization'] != 0 or $_SESSION['customer_id'] == ''))) {
  // global disable of column_right
  $flag_disable_right = true;
}
if (!isset($flag_disable_right) || !$flag_disable_right) {
?>
  <div class="<?php echo $box_width_right_new; ?>">
<?php
 /**
  * prepares and displays right column sideboxes
  *
  */
 require(DIR_WS_MODULES . zen_get_module_directory('column_right.php'));
?>
  </div>

<?php
}
?>

</div>

<?php
 /**
  * prepares and displays footer output
  *
  */
  if (CUSTOMERS_APPROVAL_AUTHORIZATION == 1 && CUSTOMERS_AUTHORIZATION_FOOTER_OFF == 'true' and ($_SESSION['customers_authorization'] != 0 or $_SESSION['customer_id'] == '')) {
    $flag_disable_footer = true;
  }
  require($template->get_template_dir('tpl_footer.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_footer.php');
?>

</div>
<!--bof- parse time display -->
<?php
  if (DISPLAY_PAGE_PARSE_TIME == 'true') {
?>
<div class="smallText center">Parse Time: <?php echo $parse_time; ?> - Number of Queries: <?php echo $db->queryCount(); ?> - Query Time: <?php echo $db->queryTime(); ?></div>
<?php
  }
?>
<!--eof- parse time display -->
<!--bof- banner #6 display -->
<?php
  if (SHOW_BANNERS_GROUP_SET6 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET6)) {
    if ($banner->RecordCount() > 0) {
?>
<div id="bannerSix" class="banners"><?php echo zen_display_banner('static', $banner); ?></div>
<?php
    }
  }
?>
<!--eof- banner #6 display -->

<!--BOF cookie control script-->
<?php if (COOKIE_CONTROL_STATUS == 'true'){?>
    <?php require($template->get_template_dir('tpl_cookie_control.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_cookie_control.php');?>
<?php } ?>
<!--EOF cookie control script-->

 <?php
if  ($detect->isMobile() && !$detect->isTablet() || $_SESSION['layoutType'] == 'mobile' ) {
  echo '</div>';
} else if ( $detect->isTablet() || $_SESSION['layoutType'] == 'tablet' ){
  echo '</div>';
} else {
  //
}
?>


<?php if  ($detect->isMobile() && !$detect->isTablet() || $_SESSION['layoutType'] == 'mobile' ) {
  require($template->get_template_dir('tpl_modules_mobile_menu.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_mobile_menu.php');
} else if ( $detect->isTablet() || $_SESSION['layoutType'] == 'tablet' ){
  require($template->get_template_dir('tpl_modules_mobile_menu.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_mobile_menu.php');
} else if ( $_SESSION['layoutType'] == 'full' ) {
  //
} else {
  //
}
?>

<?php /* add any end-of-page code via an observer class */
  $zco_notifier->notify('NOTIFY_FOOTER_END', $current_page);
?>
</body>