If you’re getting the following error when you’ve installed R 3.4.0 on Windows, you’re not alone.
Error in if (file.exists(dest) && file.mtime(dest) > file.mtime(lib) && :
missing value where TRUE/FALSE needed
The R team have released a patched version but right now it’s a little difficult to find out about. If you need/want the patched version, it’s available at:
This resolved the issue for me.
If you want more info on the issue and the resolution process, check out the r-help archive.
Hope this helps!