Power Query - data source error when trying to unpivot


So, I have a spreadsheet connected to a SharePoint list but that SharePoint list is pivoted and I need to unpivot it.  However when I do so, I get the following error


DataSource.Error: We couldn't parse OData response result. Error: A value without a type name was found and no expected type is available. When the model is specified, each value in the payload must have a type which can be either specified in the payload, explicitly by the caller or implicitly inferred from the parent value.

I've taken this same SharePoint list and plugged it into Power BI desktop and was able to unpivot it with no issues so not sure what the problem could be.


Any ideas?