QuickBooksOnline. Can't upload order. Empty ID for product Id

Hi, the plugin does not seem to be able to upload orders to QB from my site.

I get this error in the system log.
Log level Error
Short message  
Error. QuickBooksOnline. Can't upload order. Empty ID for product Id='5484'.

I am using these settings for the uploads.
Uploading mode  = manual
Upload nop order to = Sales receipt
Select product Sku = Sku

What is the Empty ID is references?
There is a SKU, Product ID, order number, and since it was PayPal the Paypal transaction id.
Was hoping this plugin would allow me better integrate with QB.

Thanks, Chris

Open the plugin configure page and enable debugging.
Try to upload the nop order and send me the plugin log file to email support@foxnetsoft.com.