Can't found EstimoteProximitySDK on iOS

I’m building an app for iOS but I can’t import EstimoteProximitySDK.
I followed all steps wrote on the guide but it doesn’t work.
Any suggest?

Did you use CocoaPods to install the SDK? If so, remember to use the .xcworkspace instead of .xcodeproj. CocoaPods bundles the libraries/dependencies into a separate Pods.xcodeproj, and creates a workspace with both your original project and the Pods.