* finish task #2885.

module/extension/view/upload.html.php

@@ -17,11 +17,21 @@
     <strong><?php echo $lang->extension->upload;?></strong>
   </div>
 </div>
+<?php if(!empty($error)):?>
+<div class='panel panel-body text-left'>
+  <div class='container mw-500px'>
+    <p class='text-danger'><?php echo $error;?></p>
+  </div>
+  <hr>
+  <?php echo html::commonButton($lang->extension->refreshPage, 'onclick=location.href=location.href');?>
+</div>
+<?php else:?>
 <form method='post' enctype='multipart/form-data' style='padding: 5% 20%'>
   <div class='input-group'>
     <input type='file' name='file' class='form-control' />
     <span class='input-group-btn'><?php echo html::submitButton($lang->extension->install);?></span>
   </div>
 </form>
+<?php endif;?>
 </body>
 </html>