Hi and thank you @hmfedders for sharing a link to your sample CSV file you are working on. I had a look and the error you are seeing is most likely from having an incomplete CSV file upon import.
There is a lot of data missing in your CSV file, like is the product taxable, does it require shipping, etc.
I recommend in situations like this to make one of your products manually in the admin and then export out the one product to use as your own custom template to see what information is needed in your CSV file. Most of it can be duplicated from that point to easily fill in the blanks of the other products.
You can also reference the information in our Help Center for columns that must have a value.