Seems the Swift version hasn't been updated for this pod, try installing the Objective-C version and use Bridging Headers that to access it in Swift
pod 'CircularSpinner' only supports upto Swift 3 only. You must find an alternate for this library and my suggestion is
pod 'UICircularProgressRing'
Take a look at https://github.com/luispadron/UICircularProgressRing . I have used this and it is very useful and highly customisable.
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