I'm guessing botocore.exceptions.ClientError: An error occurred (InvalidParameterValue) when calling the CreateRoute operation: route table rtb-9adde4fc and network gateway igw-07058f60 belong to different networks means I can't attach an Internet route to the default route table of a VPC because it's going to be a separate virtual network interface.

documentation isn't necessarily sparse, but it's spread out over many pages, and it's hard to find a step-by-step procedure to do anything using the AWS cli or boto3. so I end up adding one thing to the code; testing; getting errors with obscure or misleading error messages; Googling and analyzing; fixing, and going on to the next thing. each step can take literally hours. it's a really tough slog.

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