ECommerce editing

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Hello,

I received this error while I was trying to figure out manipulating shipping/handling methods on e-commerce. Can anyone tell me how I can fix this?

Fatal error: Call to a member function getAttributeKeyID() on a non-object in /home/dlcccorg/public_html/packages/core_commerce/models/order/model.php on line 517

 
ronyDdeveloper replied on at Permalink Reply
ronyDdeveloper
If you add two attributes with the same handle you will get this error. Look at all the attribute types like user attribute, page attribute as well as collection attribute and check where any duplicate handle is exists.

I've faced this problem before and got the same error in controller. So I thought it might be the problem but I'm not sure.

Rony