Error uploading Excel file to AGOL: 'Item with the same key has already been added'

Trippetoe

I am trying to upload an Excel file to AGOL, but i keep getting an error with the message: "Item with the same key has already been added'.  I am using the 'Add Item -> From your Computer' tool on the Content tab.  As far as i can tell, the Excel file i want to upload has never been added to my AGOL org.

Using Chrome's Dev tool,  i see the following network communications, which seem to indicate that the file upload works but the itemId already exists. Is that possible?

sharing/rest/search
{"query":"title:\"AsthmaRelatedHospitalizationRates\" AND type:\"Microsoft Excel\" AND owner:\"..........\" AND ownerfolder:\".............\"","total":0,"start":1,"num":1,"nextStart":-1,"results":[]}

sharing/rest/content/users/..../..../addItem
{"success":true,"id":"46b220edf0854c858e797c7632cb3176","folder":"2e2438a634d44787802372535a19727a"}

sharing/rest/content/users/..../..../status
{"status":"completed","statusMessage":"completed","itemId":"46b220edf0854c858e797c7632cb3176"}

sharing/rest/content/features/analyze
{"error":{"code":400,"message":"An item with the same key has already been added.","requestId":""}}

Any thoughts on how i can get the file uploaded? 

Thank you.

Trippetoe

I contacted Esri tech support about this issues, and the fine person there helped me figure out the problem. One of the sheets in the Excel file had some duplicate 'column header' values. Once we eliminated the duplicate columns, i was able to upload the file without a problem.