The formula I presented above should be copied into cell A2 of 'My solution'. A1 of 'My solution' needs to be
That should fix the circular reference error.
As for the dialog box asking you to specify which excel file you want to refer to, that probably indicates the name of your sheet isn't exactly the same as what's in the formula... other than that i'm not sure.
Finally the compatibility mode error does have something to do with changing versions of excel... or rather saving in an old format I think (.xls instead of .xlsx) I don't actually know much about that error but I believe there are certain formulas which would not work if you opened the workbook in earlier versions of excel... I'm pretty sure you can ignore it as long as you're going to use excel 2007 or higher.
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