[!] The version of CocoaPods used to generate the lockfile (1.3.1) is higher than the version of the current executable (1.1.0.beta.1).

执行pod install时，提示如下信息：

[!] The version of CocoaPods used to generate the lockfile (1.3.1) is higher than the version of the current executable (1.1.0.beta.1). Incompatibility issues may arise.

[!] Unable to find a specification for `HandyJSON (~> 4.0.0-beta.1)`

解决方法：用pod repo update 命令更新资源库即可,有时候可能也不能更新成功，然后我试了这个指令 sudo gem install cocoapods --pre，把cocoapods都更新了，在输入pod install。

注：不喜勿喷！！！