Error Message should be clear, plain, and direct

This post is about a real error message I received and puzzled through.  Luckily, because I was working with open source code, I was able to see a copy of the source, and only then did I understand what the message meant.  An error message should not require you to know and understand the source, in order to understand the message, and I think this is the root of the mistake that many programmers make.

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