I have a product catalog with 10.000 products. The price is located in the cell next to SKU (see screenshot).

After:

Basically it works about in the same way as the script by the link in the question, except it handles all IDs, even if there are several identical IDs in the document.

But the error in your question tells me that you probably have no tables in your documents (!), in this case my code will not work.