Mutations disprove the theory of upward evolution

[Esquilax]

But the changes are random and not directed by an intelligence. So they are errors.

Complete non sequitur. If there's no design then there's no overarching purpose, and hence no change to the genome can take it further away from that purpose. There's no "correct" path for there to be an error on.

Nobody takes the bytes in a complied computer program and has the bits randomly changed and expects the program to work as well.

And now you're begging the question, because we know for a fact that a computer program has been designed, and so there is a function that it was made to accomplish, and therefore any change that occurs that takes away from that is an error. Not so for genetic code.

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But only the beneficial 'errors' will be carried on to future generations. That's the whole point!

In the interests of accuracy, I have to point out that it's also not true: detrimental changes get passed on too, assuming they aren't enough to kill the organism hosting them.

Which, really, just makes Grace's (continued, baseless) claims that they are errors even more ridiculous.