[!] CocoaPods could not find compatible versions for pod "Flipper-DoubleConversion": In snapshot (Podfile.lock): Flipper-DoubleConversion (= 3.2.0.1) In Podfile: Flipper-DoubleConversion (= 3.2.0.1)None of your spec sources contain a spec satisf..

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[!] CocoaPods could not find compatible versions for pod "Flipper-DoubleConversion":
  In snapshot (Podfile.lock):
    Flipper-DoubleConversion (= 3.2.0.1)

  In Podfile:
    Flipper-DoubleConversion (= 3.2.0.1)

None of your spec sources contain a spec satisfying the dependencies: `Flipper-DoubleConversion (= 3.2.0.1), Flipper-DoubleConversion (= 3.2.0.1)`.

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 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.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

-> 해결 방법 : 그냥 나와 있는대로 pod repo update를 하고 그래도 안되길래 pod install --repo-update까지 하고나서 cd ios&&pod install 해주니까 굴러갔다.