Warning in install.packages: cannot open UR HTTP status was '404 Not Found' : <p>When running <code>install.packages</code> in the latest R (3.4) and RStudio 1.0.143 I get the following warning</p>

<pre><code>Warning in install.packages :
  cannot open URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.4/PACKAGES.rds': HTTP status was '404 Not Found'
</code></pre>

<p>This appears no matter what package(s) I select, however this does not appear to effect package installation. I tried clearing my <code>~/.rstudio-desktop</code>, <code>/Library/Frameworks/R.framework/Versions/3.4/Resources/library</code> and reinstalling R and this warning still persists. Evening changing CRAN mirrors appears to have no effect as a similar warning appears. Below is my session information.</p>

<pre><code>R version 3.4.0 (2017-04-21)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Sierra 10.12.4

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] datasets  stats     graphics  grDevices utils     methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.4.0 tools_3.4.0   
</code></pre>
