Where can I buy a new cover?

No, we can't replace a zipper, we are here to answer questions. We're not a repair service.
You may be able to cut off the zipper and sew a new one on. It depends upon what material the backpack is made of.

Bring your garment to the sewing store. Find a replacement zipper like the one on your garment and make sure the replacement zipper is long enough (ask a clerk for assistance).

Then when you get it home, you will need to carefully remove the broken zipper by cutting the thread stitching that holds the zipper in place. Use a thread nipper or seam ripper but be careful to not cut the fabric. When you get the threads cut, you should be able to remove the broken zipper. Line up the replacement zipper in the open seam, pin in place and stitch.

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Make sure it is properly hooked at the bottom. Get a cake of soap and rub it on all the zipper teeth. Carefully and slowly try to ease the zipper up. Also,make sure there is no material caught in it.

A shop that works on boat covers, canvas awnings, or convertible tops should be able to repair it.

The Sunglass fix have most models in stock, (30,000 styles) ready to ship, and will custom cut if not already available. http://www.thesunglassfix.com Von Zipper Replacement Lenses Award Winning Lenses for USA Sunglass...

Hello. The most common remark I hear from customers is that these new high capacity LG washers often make sounds more often associated with an airport. The good news is that they do an excellent job in a very "green" way, saving both power and water. If you have your machine in a space where you can close the door, do so. Otherwise, try to use it at times when the new sounds will be least bothersome. Joe

Find a Epoxy glue that will hold up to the rubber or plastic that this is applied to for it may melt the rubber if not the correct type Two Parts Epoxys are good!

bring it back or sell it to an ideot..

There is no fix.
The top has to be installed and pulled back along the sides so you have minimal gap at the zippers.
You can also get a new top.

I had this problem and did not have the time to fix it myself so I called Sears. The "tech" looked at his laptop, called his "supervisor" a couple of times and told my wife that both control boards needed replaced at a cost of over $500. The manuals, with testing procedures for the inclined, are on the inside, front cover.
The CE error is a communications failure and on mine it required replacement of the AVS board. I bought the part at a local supply house and replaced it myself for about $175.