错误集锦

一、Xcode
摘自：http://tips.tutorialhorizon.com/2015/10/01/xcrun-error-invalid-active-developer-path-library-developer-commandline-tools-missing-xcrun/

Have you upgraded to OS X El Cap­i­tan from App Store ?
Have you sud­denly started get­ting the fol­low­ing error in your project?

错误提示：xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

解决办法： xcode-select --install