I made few changes in the query editor. But when I close and apply the changes. I get the error Model object names must be non empty. I tried deleting the last changes I made in query editor. The error still exists.
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I encountered same error and it turns out the result generated a column without name. – Hua Gong Feb 26 '19 at 23:52
5 Answers
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In Power Bi, this error is saying you have empty columns in your data set. You have to delete that columns and refresh the document and it should work.

Roberto Caboni
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@HuaGong is correct. Most likely one or more columns are loaded without a name.

Ankit Kesharwani
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This says that you have left one Column heading blank. Delete the column or give a name to the column.

Saeed Ullah
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This happens when you enable "Use First Row as a header" and there are null values in the first row.

Chris
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This can also happen if the Excel (other source document you are using) is open on your desktop. You have to close the document and then try again.