Can not view invoices in backend SOLVED

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.5
-- PHP version -- : 5.4.43
-- Browser(s) name and version -- : Safari 9.0.1
-- Error-message(debug-mod must be tuned on) -- : Notice: Undefined index: s0333093 in /home1/horsesi2/public_html/libraries/joomla/session/storage/database.php on line 1
×
Invoice


Fatal error: Cannot redeclare x09f81() (previously declared in /home1/horsesi2/public_html/layouts/joomla/modal/body.php:1) in /home1/horsesi2/public_html/layouts/joomla/modal/body.php on line 1

Since upgrading to Hikashop Business 2.6.0 I can no longer view invoice details previously available in the orders listing. When I click on the order number, the only thing displaying is:

Thanks

SOLVED!
If anyone else experiences this problem, It turns out that Jan was correct, but simply clearing the cache and session using the Joomla backend didn't work for me. I was able to resolve the problem by using phpMyAdmin. I just searched for the sessions table and deleted each of the entries in the table.

Hi
try cleaning up the cash in the backend.
It looks there is something wrong with your sessions.
If that does not work. Try to find on Joomla forum on how to cleanup old sessions.

regard Jan

Thanks Jan, unfortunately clearing the cache and clearing expired sessions had no effect. The problem continues.

SOLVED
Thanks, I was able to solve it by using phpMyAdmin to search out the sessions table and manually delete the entries then. Clearing the cache and session in Joomla backend was not sufficient.