Getting error after updating xcode 5.0 to 5.1 - ios

I have updated the xcode 5.0 to 5.1 today. I run the existed project but getting the error now. I had no issues while running that project on 5.0 version. The error is below :
ld: library not found for -lIOKit
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Please someone help.
I re-added the frameworks but now I get another error which is below
ld: 62 duplicate symbols for architecture armv7s
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Try going to your project configuration -> Build Settings -> Architechtures -> Valid architectures
Check if you've got the armv7s label duplicated.
You can also try to set to YES the Build Architechtures Only.

Please Check:- goto build setting, writing in search bar "GCC", check weather compiler is setup or not (LLMV 5.xx).

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and the warning below:
missing required architecture x86_64 in file ISHPullUp.framework/ISHPullUp
Note that:
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I'm trying to use a cocoapod with my Xcode project (Swift).
When I try to Build the project it fails with:
Apple Mach-O Linker Error Group
- "_OBJC_CLASS_$_FSCalendar", referenced from:
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Errors
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UPDATE
I have added the frameworks and now I am just getting "clang: error: linker command failed with exit code 1 (use -v to see invocation)"
UPDATE
Full error:
ld: warning: directory not found for option '-F/Users/me/Documents/APP/build/Debug-iphoneos/FSCalendar'
ld: warning: directory not found for option '-F/Users/me/Documents/APP/build/Debug-iphoneos'
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I tried everything suggested on the internet for the same issue and nothing resolved this. I fully re-installed Xcode and Cocoapods, set up the project exactly the same as before and it is now working.
After I ran pod install on the new name I changed my project to, I had this error cause the pod framework was not linking to NEW project name and was still looking for OLD name.
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Summary of Error:
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Full Error:
ld: could not open bitcode temp file: /Users/Ryan/Library/Developer/Xcode/DerivedData/Unity-iPhone-
eovqdsbeqkeftcdnyutjuztsgocg/Build/Intermediates/ArchiveIntermediates/Unity
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iphoneos/Unity-iPhone.build/Objects-
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My app runs fine on a real device, but when i'm trying to run it on a simulator it gives me this error. Can anyone help me understand what's this error is ?
ld: in '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libextension.dylib', missing required architecture x86_64 in file /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libextension.dylib (3 slices) for architecture x86_64
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It seems that Xcode cannot find a libextension.dylib file that has been built for the simulator architecture that you selected. Since the .dylib file should come with Xcode, I suspect a problem with the Xcode version that you have. Did you build the project by yourself, or download it?
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