Trying to create a PivotTable (which I've done many times before) from a two column, 50 row table I have in Excel. I select the correct rows/columns and click PivotTable, but when I click "OK" in the dialog box I get the error message that "data source reference is not valid." I can't figure out what I'm doing wrong. I've done the exact same thing with nearly the same data (one column text and the other a date) but this time it won't work.
