Problem with facebook pixel and unmatched products

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Hi everyone! I need your help!!!

I've completed the setup of the FB pixel on my brand new e-commerce. However, during the testing, I've received the following message both for the "ViewContent" and "addToCart" events.

Can you please let me know if it can be fixed simply by creating a catalog on FB (which I haven't yet), or if I need to edit some code? In case I need to edit a code could you please walk me through it as I don't know much about it?

Here's a screenshot of the problem:

probelma fb.PNG


Many thanks in advance!!!