Error(s) in re-building vignettes:
--- re-building 'plotting_functions.Rmd' using rmarkdown
trying URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
Quitting from lines 28-64 (plotting_functions.Rmd) 
Error: processing vignette 'plotting_functions.Rmd' failed with diagnostics:
cannot open URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
--- failed re-building 'plotting_functions.Rmd'

--- re-building 'subbuild_function.Rmd' using rmarkdown
trying URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
Quitting from lines 27-38 (subbuild_function.Rmd) 
Error: processing vignette 'subbuild_function.Rmd' failed with diagnostics:
cannot open URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
--- failed re-building 'subbuild_function.Rmd'

--- re-building 'subtee_package.Rmd' using rmarkdown
trying URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
Quitting from lines 32-46 (subtee_package.Rmd) 
Error: processing vignette 'subtee_package.Rmd' failed with diagnostics:
cannot open URL 'https://www.uniklinik-freiburg.de/fileadmin/mediapool/08_institute/biometrie-statistik/Dateien/Studium_und_Lehre/Lehrbuecher/Multivariable_Model-building/adv_prostate_ca.zip'
--- failed re-building 'subtee_package.Rmd'

SUMMARY: processing the following files failed:
  'plotting_functions.Rmd' 'subbuild_function.Rmd' 'subtee_package.Rmd'

Error: Vignette re-building failed.
Execution halted