`device` must be a string, function or `NULL`, not the number 1.
`dpi` must be one of "screen", "print", or "retina", not "abc".
`dpi` must be a single number or string, not a <factor> object.
`dpi` must be a single number or string, not a character vector.
`dpi` must be a single number or string, not a double vector.
`dpi` must be a single number or string, not a list.
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