Please follow these steps:
1) Add any product to your cart, when you add the product to the cart a pop up will appear saying item added to the cart.
2) On that pop up click the clear cart button. This will delete all the old items in the cart.
3) After that you can add the items you want and try to check out.
If you still experience application errors during your checkout process, it may be due to a need to clear your cache. Please follow these instructions (that apply to your browser) to help remedy the issue:
How to clear the cache in Firefox, Internet Explorer, Safari and Opera
Here are instructions on how to clear your cache in the following browsers:
• Firefox:
Open Firefox and from the top tool bar go to
Tools > Clear
Private Data. Choose which items you wish to clear and click Clear
Private Data Now.
• Internet Explorer 6:
Open Internet Explorer 6 and from the top tool bar go to
Tools >
Internet Options > General.
Click
Delete Files. Check the box next to
Delete all offline content In the window that opens and click OK.
• Internet Explorer 7:
Open Internet Explorer 7 and from the top tool bar go to
Tools >
Internet Options > General. Under Browsing history click
Delete. Choose which items you wish to delete and click the
Delete button next to each item to delete it.
• Safari:
Open Safari and from the top tool bar go to
Safari >
Empty Cache. Click
Empty in the window that opens to clear the cache.
• Opera:
Open Opera and from the top tool bar go to
Tools >
Delete private data. Choose which items you wish to delete and click
Delete