xcode 中的重复符号：iOS 目标 c

问：

我收到此链接器错误，我不知道如何解决它。出于某种原因，在我导入的文件中，我有 Parse.o、Parse 2.o、Parse 3.o 等文件......难道这就是原因吗？如果是，那么我不知道如何删除这些文件，因为我没有自己创建这些文件。请帮忙！！

duplicate symbol '_OBJC_IVAR_$_PFUser._authData' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/Parse/libParse.a(PFUser 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/Parse/libParse.a(PFUser.o)
duplicate symbol '_FBLPromiseRetryDefaultAttemptsCount' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Retry 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Retry.o)
duplicate symbol '_FBLPromiseRetryDefaultDelayInterval' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Retry 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Retry.o)
duplicate symbol '_FBLWaitForPromisesWithTimeout' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Testing 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise+Testing.o)
duplicate symbol '_OBJC_IVAR_$_FBLPromise._pendingObjects' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_IVAR_$_FBLPromise._observers' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_IVAR_$_FBLPromise._error' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_IVAR_$_FBLPromise._value' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_IVAR_$_FBLPromise._state' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_CLASS_$_FBLPromise' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
duplicate symbol '_OBJC_METACLASS_$_FBLPromise' in:
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise 2.o)
    /Users/jigyasaasood/Library/Developer/Xcode/DerivedData/Goose-auuisxamodjbzmbbsalidumtweuf/Build/Products/Debug-iphonesimulator/PromisesObjC/libPromisesObjC.a(FBLPromise.o)
ld: 149 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)