installed "Admin Product Filter By Category" module but...

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$sql .= " GROUP BY pd.name"  ; 

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$sql .= " GROUP BY pd.product_id"  ; 

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 			$this->data['error_model'] = $this->error['model'];
 		} else {
 			$this->data['error_model'] = '';
 		}

+//filter category start//
+   		if (isset($this->error['category'])) {
+			$this->data['error_category'] = $this->error['category'];
+		} else {
+			$this->data['error_category'] = '';
+		}
+ //filter category stop//
 		if (isset($this->error['date_available'])) {
 			$this->data['error_date_available'] = $this->error['date_available'];
 		} else {
 			$this->data['error_date_available'] = '';

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     	if ((strlen(utf8_decode($this->request->post['model'])) < 1) || (strlen(utf8_decode($this->request->post['model'])) > 64)) {
       		$this->error['model'] = $this->language->get('error_model');
     	}

+//filter category start//
+		if (!isset($this->request->post['product_category'])) {
+      		$this->error['category'][$language_id] = $this->language->get('error_category');
+    	}
+//filter category stop//
     	if (!$this->error) {
 			return TRUE;
     	} else {
 			if (!isset($this->error['warning'])) {

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  // Error
  $_['error_permission']       = 'Warning: You do not have permission to modify products!';
  $_['error_name']             = 'Product Name must be greater than 3 and less than 255 characters!';
  $_['error_model']            = 'Product Model must be greater than 3 and less than 24 characters!';
+$_['error_category']         = 'You have to select at least one category!';
  $_['error_required_data']    = 'Required Data has not been entered. Check for field errors!';
 ?>

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           <tr>
-            <td><?php echo $entry_category; ?></td>
+            <td><span class="required">*</span> <?php echo $entry_category; ?></td>
             <td><div class="scrollbox">
                 <?php $class = 'odd'; ?>
                 <?php foreach ($categories as $category) { ?>
                 <?php $class = ($class == 'even' ? 'odd' : 'even'); ?> 
                 <div class="<?php echo $class; ?>">
                   <?php if (in_array($category['category_id'], $product_category)) { ?>
                   <input type="checkbox" name="product_category[]" value="<?php echo $category['category_id']; ?>" checked="checked" />
                   <?php echo $category['name']; ?>
                   <?php } else { ?>
                   <input type="checkbox" name="product_category[]" value="<?php echo $category['category_id']; ?>" />
                   <?php echo $category['name']; ?>
                   <?php } ?>
                 </div>
                 <?php } ?>
-              </div></td>
+              </div>
+              <?php if (isset($error_category[$language['language_id']])) { ?>
+              <span class="error"><?php echo $error_category[$language['language_id']]; ?></span>
+              <?php } ?></td>
+            </td>
           </tr>
           <tr>