issue with a invalid argument error

[mfdc]

Hi I'm really hoping you can help me, and I'm trying to give as much information as I can, I'm getting an invalid argument supplied for foreach() error, which is referencing the following code (see below) - is their anything obvious you can see? I appreciate I'm a thicko

<section class="categorynews">
			<?php $categories = thb_HomePageCategories();?>
			<?php foreach($categories as $category) { ?>
				<?php $color = GetCategoryColor($category); ?>
			    
				<div class="categoryholder cf">
					<div class="categoryheadline" style="border-color:<?php echo $color; ?>">
						<h2><?php $cat = get_category($category); echo $cat->name; ?></h2>
						<span><a href="<?php echo get_category_link($category); ?>" style="color:<?php echo $color; ?>"><?php _e( '<i class="icon-long-arrow-right"></i> View All Articles', THB_THEME_NAME ); ?></a></span>
					</div>

[Ch0cu3r]

Make sure thb_HomePageCategories() is returning an array.

 

What is the output of

printf('<pre>%s</pre>', print_r($categories, true));