cocosapods pod install 报错

cocosapods  pod install  报错

Analyzing dependencies

[!] Unable to satisfy the following requirements:

- `SDWebImage (~> 3.8)` required by `Podfile`

None of your spec sources contain a spec satisfying the dependency: `SDWebImage (~> 3.8)`.

You have either:
 * out-of-date source repos which you can update with `pod repo update`.
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.

当前cocopods版本较低，无法获取最新的第三方库，尝试更新cocoapods 然后重试，

更新cocoapods  ， pod setup