[Plugin: Advanced Custom Fields – NextGEN Gallery Field add-on] Wrong data type error message

Unfortunately when I upgraded to version 1.2.1, I still get the same error message as above on my editing screen, nor do my slideshows work. I reverted to version 1.0.2 and it works fine.

I tried resaving the post and that’s when I see the “[Gallery Not Found]” message on the post (after refreshing.

<div id="header-image">
            <?php if(is_front_page()) { ?>
            <?php
			if (function_exists("nggSlideshowWidget"))
			nggSlideshowWidget(3,960,460);
			?>
            <? } else { ?>
			<?php
                        $garr = get_field('nextgen_gallery_id');
                        $gid = 0;
                        if(is_array($garr))
                        {
                                if(isset($garr[0])) {
                                        $gid = intval($garr[0]);
				}

                                if($gid > 0) {
                                        echo nggShowGallery($gid);
				} else {
                                        ?>
										<?php
					// Compatibility with versions of WordPress prior to 3.4.
					if ( function_exists( 'get_custom_header' ) ) {
						// We need to figure out what the minimum width should be for our featured image.
						// This result would be the suggested width if the theme were to implement flexible widths.
						$header_image_width = get_theme_support( 'custom-header', 'width' );
					} else {
						$header_image_width = HEADER_IMAGE_WIDTH;
					}

					// Check if this is a post or page, if it has a thumbnail, and if it's a big one
					if ( is_singular() && current_theme_supports( 'post-thumbnails' ) &&
							has_post_thumbnail( $post->ID ) &&
							( /* $src, $width, $height */ $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-thumbnail' ) ) &&
							$image[1] >= $header_image_width ) :
						// Houston, we have a new header image!
						echo get_the_post_thumbnail( $post->ID );
					elseif ( get_header_image() ) :
						// Compatibility with versions of WordPress prior to 3.4.
						if ( function_exists( 'get_custom_header' ) ) {
							$header_image_width  = get_custom_header()->width;
							$header_image_height = get_custom_header()->height;
						} else {
							$header_image_width  = HEADER_IMAGE_WIDTH;
							$header_image_height = HEADER_IMAGE_HEIGHT;
						}
					?>
						<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo $header_image_height; ?>" alt="" />
					<?php endif; ?>

										<?php
				}
                        }
                        else
                        {
                                ?>
								<?php
					// Compatibility with versions of WordPress prior to 3.4.
					if ( function_exists( 'get_custom_header' ) ) {
						// We need to figure out what the minimum width should be for our featured image.
						// This result would be the suggested width if the theme were to implement flexible widths.
						$header_image_width = get_theme_support( 'custom-header', 'width' );
					} else {
						$header_image_width = HEADER_IMAGE_WIDTH;
					}

					// Check if this is a post or page, if it has a thumbnail, and if it's a big one
					if ( is_singular() && current_theme_supports( 'post-thumbnails' ) &&
							has_post_thumbnail( $post->ID ) &&
							( /* $src, $width, $height */ $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-thumbnail' ) ) &&
							$image[1] >= $header_image_width ) :
						// Houston, we have a new header image!
						echo get_the_post_thumbnail( $post->ID );
					elseif ( get_header_image() ) :
						// Compatibility with versions of WordPress prior to 3.4.
						if ( function_exists( 'get_custom_header' ) ) {
							$header_image_width  = get_custom_header()->width;
							$header_image_height = get_custom_header()->height;
						} else {
							$header_image_width  = HEADER_IMAGE_WIDTH;
							$header_image_height = HEADER_IMAGE_HEIGHT;
						}
					?>
						<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo $header_image_height; ?>" alt="" />
					<?php endif; ?>

								<?php
                        } }
			?>
			</div>

Hello,
I never was able to figure this out months ago. The site is now ready to go live, other than this problem. I have upgraded all plugins and we are running WP 3.5. I still get the same errors as listed in my initial post, and the galleries do not appear and say [Gallery Not Found].

When I added the code above, I get this on my page:

Array ( [0] => Array ( [ngg_id] => 11 [ngg_form] => gallery ) ) [Gallery not found]

I am not very well versed in PHP…what does this mean?