这是我的podfile
pod 'AFNetworking', '~> 2.1.0'
当我尝试pod安装时，我正在
[！] Pod :: Executable pull
U ALPValidator / 0.0.1 / ALPValidator.podspec
APAsyncDictionary / 0.0.3 / APAsyncDictionary.podspec
ASCScreenBrightnessDetector / 0.1.0 / ASCScreenBrightnessDetector.podspec
Appboy-iOS-SDK / 2.3.1 / Appboy-iOS-SDK.podspec
AuthorizeNet / 0.1.0 / AuthorizeNet.podspec
CTFeedback / 1.0.8 / CTFeedback.podspec
U CardIO / 3.2.2 / CardIO.podspec
U CardIO / 3.3.0 / CardIO.podspec
U CardIO / 3.4.1 / CardIO.podspec
U CardIO / 3.4.4 / CardIO.podspec
A Colors / 4.1 / Colours.podspec
FXBlurView / 1.5.3 / FXBlurView.podspec
M Facebook-iOS-SDK / 3.9.0 / Facebook-iOS-SDK.podspec
FreeStreamer / 1.5.3 / FreeStreamer.podspec
GoldenFleece / 1.1 / GoldenFleece.podspec
Google-Mobile-Ads-SDK / 6.8.0 / Google-Mobile-Ads-SDK.podspec
IOSLinkedInAPI / 2.0.0 / IOSLinkedInAPI.podspec
JDStatusBarNotification / 1.4.7 / JDStatusBarNotification.podspec
JSONJoy / 0.1.0 / JSONJoy.podspec
KTBTaskQueue / 1.0.0 / KTBTaskQueue.podspec
LINEActivity / 0.2.0 / LINEActivity.podspec
U LetsMove / 1.9 / LetsMove.podspec
LumberjackPrettyClassInformation / 1.0.0 / LumberjackPrettyClassInformation.podspec
MSCachedAsyncViewDrawing / 1.0.1 / MSCachedAsyncViewDrawing.podspec
MUKAdMobViewController / 1.2.1 / MUKAdMobViewController.podspec
MUKAdMobViewController / 1.2.2 / MUKAdMobViewController.podspec
MUKAdMobViewController / 1.2 / MUKAdMobViewController.podspec
MUKToolkit / 1.1.1 / MUKToolkit.podspec
NXOAuth2Client / 1.2.5 / NXOAuth2Client.podspec
A PubNub/3.5.5/PubNub.podspec A RestReaper/0.1.1/RestReaper.podspec A SatelliteStore/1.0.0/SatelliteStore.podspec A UIImage+Dummy/0.0.2/UIImage+Dummy.podspec A WYPopoverController/0.1.8/WYPopoverController.podspec Pull is not possible because you have unmerged files. Please, fix them up in the work tree, and then use 'git add/rm <file>' as appropriate to mark resolution, or use 'git commit -a'.
问题是什么？我该如何解决这个问题？