None of your spec sources contain a spec satisfying the dependency: PromiseKit (~> 7.0.0-rc1).

[denandreychuk]

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• out-of-date source repos which you can update with pod repo update or with pod install --repo-update.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.) during validation.

pod repo update has no effect.

[mxcl]

Use v6.

[denandreychuk]

I decided to move part of the project into a separate framework. The current code base is written in v7 + I cannot specify a specific version in the Podspec file of my framework.

[mxcl]

We will push to trunk at some point, sorry for the delay, currently not sure how CocoaPods handles RCs and don’t want to upgrade people from v6 accidentally.

[wvteijlingen]

Running into the same problem, and I'm a bit confused about this line in the instructions:

(...) You can still use it but you will need to specify the podspec URL manually, see the Cocoapods docs.

What exactly do I need to specify in my Podfile to use the release candidate?

[mxcl]

Exactly? I have no idea. If something more vague will do, then look for the documentation that tells you how to refer to a git tag from GitHub. If that makes no sense then I recommend sticking with v6.