This is Sara, Shopify Guru :) - Thank's for reaching out.
Often, this error comes up temporarily when many products are uploading at once, and can often be solved by editing any of the specific errors identified, and re-uploading them. Alternatively this could be a result of missing GTIN numbers, or blank product prices.
If you do not see any specific errors on your products, or are still running into issues, I am going to reach out to you directly by email, and we can look into your account specifically.
We'll be in touch soon!