Error(s) in re-building vignettes:
  ...
--- re-building ‘getstarted.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2001/mies_2001.zip'
Content type 'application/zip' length 254395 bytes (248 KB)
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downloaded 248 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2002/mies_2002.zip'
Content type 'application/zip' length 256701 bytes (250 KB)
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downloaded 250 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2003/mies_2003.zip'
Content type 'application/zip' length 251684 bytes (245 KB)
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downloaded 245 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2004/mies_2004.zip'
Content type 'application/zip' length 253012 bytes (247 KB)
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downloaded 247 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2005/mies_2005.zip'
Content type 'application/zip' length 258990 bytes (252 KB)
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downloaded 252 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2006/mies_2006.zip'
Content type 'application/zip' length 232205 bytes (226 KB)
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downloaded 226 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2007/mies_2007.zip'
Content type 'application/zip' length 236278 bytes (230 KB)
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downloaded 230 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2008/mies_2008.zip'
Content type 'application/zip' length 238100 bytes (232 KB)
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downloaded 232 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2009/mies_2009.zip'
Content type 'application/zip' length 273007 bytes (266 KB)
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downloaded 266 KB

trying URL 'https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/dane_hydrologiczne/miesieczne/2010/mies_2010.zip'
Content type 'application/zip' length 280458 bytes (273 KB)
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downloaded 273 KB

Quitting from lines 87-89 (getstarted.Rmd) 
Error: processing vignette 'getstarted.Rmd' failed with diagnostics:
argument 3 is not a vector
--- failed re-building ‘getstarted.Rmd’

SUMMARY: processing the following file failed:
  ‘getstarted.Rmd’

Error: Vignette re-building failed.
Execution halted