Joomla 3.0 + Hikashop eShop Bug Solving

Hello. We have an eshop with Hikashop in Joomla 3.0 and we have the following bugs: 1. When a new user register, the following error appears: Warning: Creating default object from empty value in /home/domain/public_html/administrator/components/com_hikashop/classes/[login to view URL] on line [login to view URL] PS: The user is registered without problem. Just the error appears. The registrations is completed withouts any other issues. 2. Search: The search module is in frontpage. When we try to search something, then it just redirects to homepage and it doesnt work. (notice, we already have a necessary redirection of not www. to www. to the site, so you have to fix that without removing our redirection) 3. Search: The search module only allows a few (i think 20 characters). We need more! We need it to allow at least 80 characters to search! 4. Change Adress Error: When a user tries to change his address from: [login to view URL] , then an error 403 not found appears! 5. Payment through bank issue. There is a bank payment method but it has a bug. When there are too many characters in the address, then there is an error in the bank page. The bank doesnt care about the clients address and this is a miss config of the previous developer. So you will be given the bank specs to check all 4 .php files for the bank in order to make the bank payment work properly. (I hope I explained it simple). Extra notes: The programmer that will be assigned the project, will be given more tasks on this and we want a permanent cooperation on the future. Please write "OK" only if you understand the tasks and you are experienced hikashop programmer.