Error #2044: Unhandled ioError:. text=Error #2032: Stream Error. Cannot be caught - ActionScript.org

Error #2044: Unhandled ioError:. text=Error #2032: Stream Error. Cannot be caught ActionScript 3.0 ... I need to do it this way because i know that some of the files I'm trying to load do not yet exist. But what could possibly be wrong with this line?

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