Calling Subroutine from Another Open Workbook Failing

I was looking at this article: http://www.vbaexpress.com/kb/getarticle.php?kb_id=279

The code they use to call the function is:

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I modified the function to look like this as I do not return a value with my subroutine:

Application.Run macros.xls!sampleMacro( WBName, SheetName, ColumnLetter)

and I received this error, "Object Required". Where is my syntax wrong?

I think I figured it out:

Application.Run "macros.xls!sampleMacro", TargetName, SheetName, ColumnLetter