To fix this error, we recommend redownloading items from scratch in QuickBooks. This will create a new product list in Webgility, allowing us to eliminate any items that may have been deleted or have invalid mappings.

Please follow the steps below to download QuickBooks and sales channel items from scratch:
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1). Download the latest sales channel data in Webgility Desktop by following the instructions in this help article: LINK

2). Next, download the latest accounting data from scratch by following the instructions provided in this help article: LINK

3). Once you have completed the above steps, proceed with the following article to remove any invalid mappings: LINK

Following these guidelines should help resolve the issue and allow you to process your order successfully. If you encounter any further problems or require additional assistance, please don't hesitate to reach out to our support team.