Error messages at checkout

-- url of the page with the problem -- : fireworksland.com/stores/shirts/2013-05-09-03-23-30/checkout
-- HikaShop version -- : HikaShop Essential 2.4.0
-- Joomla version -- : Joomla! 3.4.1
-- PHP version -- : 5.4.38
-- Browser(s) name and version -- : Firefox 36.0.4, Safari 8.0.4
-- Error-message(debug-mod must be tuned on) -- : Notice: Undefined property: stdClass::$container in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 351

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 266

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 268

Notice: Undefined property: stdClass::$container in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 351

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 266

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 268

Notice: Undefined property: stdClass::$container in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 351

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 266

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 268

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 266

Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 268

Warning: Invalid argument supplied for foreach() in /home/rjweaver/public_html/components/com_hikashop/views/checkout/view.html.php on line 779

Help!

Everything used to work. Now I get error messages whenever an item is added to the cart or a checkout is started.

Thank you!

Hello,
Can you go to your USPS shipping configuration page, save your configuration by clicking on the "Save" button and then try it again.

Thank you for your reply. I did that, and it got rid of those messages like:
Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 266

However, at checkout, I still have 2 error messages showing:

At the top of the checkout page:
Warning: Invalid argument supplied for foreach() in /home/rjweaver/public_html/components/com_hikashop/views/checkout/view.html.php on line 779

And at the bottom of the page, in a yellow box:
JFolder: :files: Path is not a folder. Path: /home/rjweaver/public_html/media/com_hikashop/images/payment/

The page I get these messages on is:
fireworksland.com/stores/shirts/2013-05-09-01-20-03/checkout

Can you help me clear those up?
Thank you.

Hello,
Can you give me a temporary back-end and FTP access to your website so that I can directly test it ?
Thanks.

OK, thank you. I have sent you a PM with the login information.

Hello,
I just tested your FTP access, and it was empty, did you gave me the good access ?

Yes, what happened was, when I created the FTP account for you, it created an empty directory and that was your default path when you logged in. That's why you saw an empty directory. With your FTP client you could navigate to the hikashop directory.
But now I have changed it so that your default path is the hikashop directory. If you log in again, you should see that you are looking at the com_hikashop directory.
Thank you for your help

Ok, thanks for the access, but I don't see the error message anymore, did you get rid of it ?

Thank you for your reply. Yes, I did fix the errors. Here is what I did:

1. For the error:
Notice: Undefined property: stdClass::$sort_by_price in /home/rjweaver/public_html/plugins/hikashopshipping/usps/usps.php on line 268
To fix it, I opened the USPS shipping options and saved it. That eliminated those error messages.

2. For the error:
Warning: Invalid argument supplied for foreach() in /home/rjweaver/public_html/components/com_hikashop/views/checkout/view.html.php on line 779

nicolas wrote, "This message indicates that you removed all the images in either the folder media/com_hikashop/images/payment or media/com_hikashop/images/shipping."

I turned off error reporting in Joomla, and that stopped that error from appearing.


3. For the error:
JFolder: :files: Path is not a folder. Path: /home/rjweaver/public_html/media/com_hikashop/images/payment/

I just went to the /images directory, and created a new folder there called payment
That got rid of that error.

So there are no other error messages now.
Thank you for your offer to help!