WP E-COMMERCE ошибка с вариациями

Внезапно появилась такая вот ошибка при вызове вариаций:
Fatal error: Call to a member function have_variation_groups() on a non-object in ********/wp-content/plugins/wp-e-commerce/wpsc-includes/product-template.php on line 1342

<?php if (wpsc_have_variation_groups()) { ?>
                        <fieldset><legend><b>Параметры продукта</b>:</legend>
						<div style="margin-top:10px" class="wpsc_variation_forms">
                        	<table>
							<?php while (wpsc_have_variation_groups()) : wpsc_the_variation_group(); ?>
								<tr><td style="padding:10px 0px" class="col1"><label for="<?php echo wpsc_vargrp_form_id(); ?>"><b><?php echo wpsc_the_vargrp_name(); ?></b>:</label></td>
								<td class="col2"><select class="wpsc_select_variation" name="variation[<?php echo wpsc_vargrp_id(); ?>]" id="<?php echo wpsc_vargrp_form_id(); ?>">
								<?php while (wpsc_have_variations()) : wpsc_the_variation(); ?>
									<option value="<?php echo wpsc_the_variation_id(); ?>" <?php echo wpsc_the_variation_out_of_stock(); ?>><?php echo wpsc_the_variation_name(); ?></option>
								<?php endwhile; ?>
								</select></td></tr>
							<?php endwhile; ?>
                            </table>
						</div>
                        </fieldset>
						<?php } ?>