You might try to replace the foreach( $myCarousel as $carousel ) with:
foreach($myCarousel as $carousel){
$myimg = get('projectdetails_image',1,$carousel);
if ( !$myimg ) {
// use this if you want to show a default image when no image is available in the post
$myimg = get_template_directory_uri().'/images/default_banner.jpg';
}
if ( $myimg ) {
echo "<div class="item".( $counter == 0 ? " active' : '' )."'>";
echo '<img src="';
echo $myimg;
echo '"/>';
echo "</div>";
$counter++;
$videos = get_order_field('video_vimeo');
foreach($videos as $video){
if ( get('video_vimeo',TRUE) ) {
echo "<div class="item black"><div id='video-wrap'>";
echo get('video_vimeo',1,$video);
echo "</div></div>";
}
}
}
}