Maintainer: ‘Arne Henningsen <arne.henningsen@gmail.com>’

No Authors@R field in DESCRIPTION.
Please add one, modifying
  Authors@R: c(person(given = "Arne",
                      family = "Henningsen",
                      role = c("aut", "cre"),
                      email = "arne.henningsen@gmail.com"),
               person(given = c("Jeff", "D."),
                      family = "Hamann",
                      role = "aut"))
as necessary.

Found the following (possibly) invalid file URIs:
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  URI: filee90551d846ba3.html
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    From: inst/doc/systemfit.pdf
  URI: filee90551d846ba3.html
    From: inst/doc/systemfit.pdf