安装GoogleAdMobAdsSDK的问题

我的PodFile:
platform :ios, ‘6.0’
pod ‘Google-AdMob-Ads-SDK’

安装的日志:
Updating local specs repositories

CocoaPods 1.1.0.beta.1 is available.
To update use: gem install cocoapods --pre
[!] This is a test version we’d love you to try.

For more information see http://blog.cocoapods.org
and the CHANGELOG for this version http://git.io/BaH8pQ.

Analyzing dependencies
Downloading dependencies
Installing Google-AdMob-Ads-SDK (6.12.2)
Generating Pods project
Integrating client project
Sending stats
Sending stats
Pod installation complete! There is 1 dependency from the Podfile and 1 total
pod installed.

[!] The Landlord-iPad [Debug] target overrides the HEADER_SEARCH_PATHS build setting defined in Pods/Target Support Files/Pods/Pods.debug.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

[!] The Landlord-iPad [Debug] target overrides the OTHER_LDFLAGS build setting defined in Pods/Target Support Files/Pods/Pods.debug.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

[!] The Landlord-iPad [Release] target overrides the HEADER_SEARCH_PATHS build setting defined in Pods/Target Support Files/Pods/Pods.release.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

[!] The Landlord-iPad [Release] target overrides the OTHER_LDFLAGS build setting defined in Pods/Target Support Files/Pods/Pods.release.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

打开xcworkspace后,发现Pods下面的Google-AdMob-Ads-SDK目录是空的,而且Frameworks下也只有一个Foundation.framework
请问该怎么办?