You probably tried to use an import to update existing products, but gave a wrong SKU. For example, because you changed the SKU online after initially creating the product, but but still refer to the old SKU when trying to update.
Discussion: Because you gave a SKU of a non-existing product, Magento assumes you want to create rather than update a product. When creating a product, the product “type” field (simple product, configurable product etc.) value is mandatory, but you did not have that column it in your CSV data for updating products.
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