linker error when add static library - ios

Question

I have a static library(libMoboSDK.a file) and a folder(.h files). Then try to add to my project. When I add I got error with library search paths, not sure for the root cause. But when many search, I tried to delete Library search paths as advice on stackoverflow. But after that I got the error:
ld: library not found for -lMoboSDK
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Ld /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator/TestMoboLibfile.app/TestMoboLibfile normal i386
cd /Users/nle/Documents/Projects/TestMoboLibfile
export IPHONEOS_DEPLOYMENT_TARGET=7.1
export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk -L/Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator -F/Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator -F/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/Developer/Library/Frameworks -F/Applications/Xcode.app/Contents/Developer/Library/Frameworks -F/Users/nle/Documents/FacebookSDK -filelist /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Intermediates/TestMoboLibfile.build/Debug-iphonesimulator/TestMoboLibfile.build/Objects-normal/i386/TestMoboLibfile.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -ObjC -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=7.1 -framework FacebookSDK -weak_framework AdSupport -weak_framework CoreTelephony -weak_framework StoreKit -weak_framework XCTest -lMoboSDK -framework CoreGraphics -framework UIKit -framework Foundation -lMoboSDK -Xlinker -dependency_info -Xlinker /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Intermediates/TestMoboLibfile.build/Debug-iphonesimulator/TestMoboLibfile.build/Objects-normal/i386/TestMoboLibfile_dependency_info.dat -o /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator/TestMoboLibfile.app/TestMoboLibfile
I had tried many research. But also cannot solve the prolem.Here is my setting:
Thanks in advance.
Update: After many tried, I got the error which have the same describe with many errors on stackoverflow. But also cannot find a solution can resolve my problem. Here is the new describe of error:
ld: warning: ignoring file /Users/nle/Documents/Projects/TestMoboLibfile/libMoboSDK.a, missing required architecture i386 in file /Users/nle/Documents/Projects/TestMoboLibfile/libMoboSDK.a (3 slices)
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_MoboSDK", referenced from:
objc-class-ref in MainViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Ld /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator/TestMoboLibfile.app/TestMoboLibfile normal i386
cd /Users/nle/Documents/Projects/TestMoboLibfile
export IPHONEOS_DEPLOYMENT_TARGET=7.1
export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk -L/Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator -L/Users/nle/Documents/Projects/TestMoboLibfile -L/Users/nle/Library/Developer/Xcode/DerivedData/TestMoboSDK-Client-dszxjhzvvskuqjfzvsxotqrpwfdr/Build/Products/Debug-iphoneos -L/Users/nle/Documents/Projects/TestMoboLibfile -F/Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator -F/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/Developer/Library/Frameworks -F/Applications/Xcode.app/Contents/Developer/Library/Frameworks -F/Users/nle/Documents/FacebookSDK -filelist /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Intermediates/TestMoboLibfile.build/Debug-iphonesimulator/TestMoboLibfile.build/Objects-normal/i386/TestMoboLibfile.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -ObjC -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=7.1 -lMoboSDK -framework FacebookSDK -weak_framework AdSupport -framework CoreTelephony -framework StoreKit -weak_framework XCTest -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Intermediates/TestMoboLibfile.build/Debug-iphonesimulator/TestMoboLibfile.build/Objects-normal/i386/TestMoboLibfile_dependency_info.dat -o /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboLibfile-dledhcaafocrregpqyxrmoqdaokd/Build/Products/Debug-iphonesimulator/TestMoboLibfile.app/TestMoboLibfile