Upgrade from Hikashop 1.4.3 to 1.5.4

I upgraded from Hikashop (business) 1.4.3 to 1.5.4, (Joomla 1.5.22) and got the following error in the administrator screen when trying to view the products:
Catchable fatal error: Object of class hikashopPublishedType could not be converted to string in /home/benshosh/public_html/test/administrator/components/com_hikashop/views/product/tmpl/listing.php on line 31

In addition on the site itself, when refreshing the cart, products get duplicated.

I am trying the upgrade on a test subdomain of my site.

Thanks for your help

Yossi

Hi Nicolas,

I downloaded the package again and installed it but got the exact same error on the backend.

For the front-end refresh problem the site happens with all products for example:
test.kabbalahinsights.com/products/the-72-names-cards

Thanks
Yossi

Correction, the front end problem only happens with some of the products, not all of them

After double checking, the front end problem happens with all products.
Refreshing the cart causes duplication.

Reverting the override on the views did solve the front end problem. Thank you!
The backend error is still there even after I manually put all the files in the directory administrator/components/com_hikashop/views/product/
and replaced them with the package I downloaded

The error I get is:
Catchable fatal error: Object of class hikashopPublishedType could not be converted to string in /home/benshosh/public_html/test/administrator/components/com_hikashop/views/product/tmpl/listing.php on line 31

OK I finally downloaded the correct package and the product view in the back end now works

I must have downloaed an older cached copy before...

Thanks

Yossi