[R-SIG-Finance] Problem when installing quantmod package

[Baki UNAL]

Hello 
I tried to install "quantmod" package. But I got the following error:
> install.packages("quantmod")Warning in install.packages :  unable to access index for repository https://cran.rstudio.com/src/contrib:  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'Installing package into ‘C:/Users/win7120/Documents/R/win-library/3.2’(as ‘lib’ is unspecified)Warning in install.packages :  unable to access index for repository https://cran.rstudio.com/src/contrib:  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'Warning in install.packages :  package ‘quantmod’ is not available (for R version 3.5.1)Warning in install.packages :  unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.5:  cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'
What is the problem?
Best regards
Baki Ünal
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