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Problems with roxygen2 when building package

Hi
I am trying to build my own package. When I run in RStudio (R3.3.2, all packages updated, Roxygen available, Windows 10 machine) build-document, I get the following error message:

==> devtools::document(roclets=c('rd', 'collate', 'namespace', 'vignette'))

Fehler in check_dep_version(pkg, version, compare) : 
  Dependency package roxygen2 not available.
Ruft auf: suppressPackageStartupMessages ... <Anonymous> -> check_suggested -> check_dep_version
Ausf?hrung angehalten

Any suggestions, would be welcome

Renger

__________________________________________________
Dr. Renger van Nieuwkoop
Department of Management, Technology and Economics??????????? 
Centre for Energy Policy and Economics???????????????????????????????????????? ?????? 
Swiss Federal Institute of Technology Zurich??????????????????????? ?????????????? ??? 
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Mobile:???+41 79 818 53 73
E-Mail:??? rengerv at ethz.ch 
?
Director Modelworks
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