Package for ios on windows

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this is my first time to package for ios on window,the project was the example project and i don’t change anythind . i get Certificates( .mobileprovision and .p12 files)from my friend who apple developer account(i only have free account). i copy these file to mac and install them by double click these file on mac. and also drag the key from login to system. and then import these Certificates in project on windows. but still get error after some time of packaging. it seems about Certificates problem. i has search google and try many solutions,but sill cannot solve it.please anyone helps!!!
i also try xcode7 \ xcode8, get the same error.
the ue4 engine is build from source :Version: 4.16.0-0+++UE4+Release-4.16