The document “podfile” could not be opened in CococaPods client

Question

Use CococaPods client to open the podfile meet the error below:

The document “podfile” could not be opened

I also token pictures to show detail:

You see, I can not open the podfile and Podfile.lock

With the error:

So, how to open the podfile with CocoaPods client?

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Edit -1

My CocoaPods client is download from here: CocoaPods client, and its version is v-1.1.1.

The download link is:https://github.com/CocoaPods/CocoaPods-app/releases/download/1.1.1/CocoaPods.app-1.1.1.tar.bz2/