我将R更新为最新版本“ R版本3.3.3（2017-03-06）”。我正在使用macOS Mojave。
现在，当我尝试在Markdown中编织代码时，出现错误。我认为这是因为我没有“ yaml”软件包的更新版本。但是，当我尝试更新“ yaml”软件包时，出现以下错误：
installing the source package ‘yaml’
trying URL 'https://cran.rstudio.com/src/contrib/yaml_2.2.0.tar.gz'
Content type 'application/x-gzip' length 89447 bytes (87 KB)
==================================================
downloaded 87 KB
Warning in strptime(xx, f <- "%Y-%m-%d %H:%M:%OS", tz = tz) :
unknown timezone 'zone/tz/2019a.1.0/zoneinfo/America/Chicago'
* installing *source* package ‘yaml’ ...
** package ‘yaml’ successfully unpacked and MD5 sums checked
** libs
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
ERROR: compilation failed for package ‘yaml’
* removing ‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library/yaml’
* restoring previous ‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library/yaml’
Warning in install.packages :
installation of package ‘yaml’ had non-zero exit status
The downloaded source packages are in
‘/private/var/folders/_r/cgv1gmqx1vzgv25k1k805lyw0000gn/T/RtmpagnKIL/downloaded_packages’