Compiler error when compiling for iOS

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I followed this guide ( http://docs.opencv.org/doc/tutorials/introduction/ios_install/ios_install.html ) exactly but when executing the script it eventually gives me the following error. How can I fix this?

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't open file: /Users/chrisherbon/Downloads/ios/build/iPhoneOS-armv7s/3rdparty/libjpeg/OpenCV.build/Release-iphoneos/libjpeg.build/Objects-normal/armv7s/jmemansi.o (No such file or directory)
    Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool failed with exit code 1


    ** BUILD FAILED **


    The following build commands failed:
        Libtool /Users/chris/Downloads/ios/build/iPhoneOS-armv7s/modules/world/UninstalledProducts/libopencv_world.a normal armv7s