Knit error. Object not found

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When you knit something it gets executed in a new environment.
The object adult is in your environment at the moment, but not in the new one knit creates.

You probably did not include the code to read or load adult in the knit.

If you clear your workspace, as per @sebastian-c comment, you will see that even ctrl+enter does not work.

You have to create the adult object inside your knit. For example, if your data in from a csv add 

adult <- read.csv2('Path/to/file')

in the first chunk.

Hope this is clear enough.

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