SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'sku'

You have an empty SKU in your import, probably more than one of them. Take a look at your import to see.

Sorry, I don't understand the question.

As far as I know, you need to either ignore the errors or you need to clean your input data. This is really a Feeds thing, not Commerce feeds.

I don't understand where the error is neither, the first error you're getting is most likely caused by an empty/wrong SKU reference in your source of import, about the second issue, I assume you're mapping PLU against SKU and I'm not sure PLU is unique at all.

Closing this one, please feel free to reopen it with more details on how to reproduce the error.

I had the same problem and it turned out that I had " ; " instead of a comma as separator. I adjusted it right before the import (/import) and it worked.

I'm getting this same error. My importer is set to "Update existing products" so I'd expect the importer to not complain and simply update the existing product.

I suspect it could be because I'm importing from an Ubercart site where the SKU contains spaces. I will get back here after turning the spaces into underscores.

Turned spaces into dashes with UPDATE uc_products SET model = REPLACE(model, ' ', '-') and now all seems fine!

I have been able to reliably reproduce this error by setting up an import, setting it to update existing nodes, and then not setting an intrinsically unique identifier to "unique" in the feild mappings. If you do that, you'll reliably get this error.

Hi Johns10, you helped me a lot. I forgot to set "unique" by this importer.
Can't better errormessages be displayed?
Thanks again and greetings, Martijn

#9 works, thanks! Seems like a need 2 unique identifiers (e-mail and username in my case).