I have this error message

Invalid argument supplied for foreach() in /home/henstobp/public_html/libraries/joomla/registry/registry.php on line 227

any sugestiopns how to fix this

Kind regards

That's an error in joomla. Hard to help you without more information. What version of HikaShop and Joomla you're using ?
On which page do you have that message ? Could you activate the debug mode of joomla and see if you get another error message with more information ?