/usr/bin/codesign failed with exit code 1 cause:No such file or directory

CodeSign /Users/fanqianwen/Library/Developer/Xcode/DerivedData/iMOKO-duxwwacqnokyogbaoufeiplaswao/Build/Products/Debug-iphonesimulator/iMOKO.app
    cd /Users/fanqianwen/meituan/iMOKO/iMOKO
    export CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
  
Signing Identity:     "-"


    /usr/bin/codesign --force --sign - --timestamp=none /Users/fanqianwen/Library/Developer/Xcode/DerivedData/iMOKO-duxwwacqnokyogbaoufeiplaswao/Build/Products/Debug-iphonesimulator/iMOKO.app


/Users/fanqianwen/Library/Developer/Xcode/DerivedData/iMOKO-duxwwacqnokyogbaoufeiplaswao/Build/Products/Debug-iphonesimulator/iMOKO.app: No such file or directory
Command /usr/bin/codesign failed with exit code 1

when linking period ,the error occur ?

what should I do ?

what does Signing Identity: "-" mean?

there are I have done:

1)clean my project

2)clean derived data

3)check which codesign