I have had the same error, which should be fixed by selecting a “Default Selections” drop down from the variations tab. In doing so this causes a new error. When you change the variation from the default selected to another variation, the SKU number doesn’t change. Even though in the cart/checkout/order email the variation is the correct name, the variation SKU did not change.
How can this be resolved?
I am having the same issue that you are having. I haven’t found a solution yet.
I’m getting this issue too. I sent a tweet to the developer of this plugin
