You are missing a function you are trying to link with:
“UATHelper: Packaging (Windows (64-bit)): UnrealBuildTool: UELinkerFixups.cpp.obj : error LNK2019: unresolved external symbol “void __cdecl EmptyLinkFunctionForStaticInitializationCreaturePackRuntimePlugin(void)” (?EmptyLinkFunctionForStaticInitializationCreaturePackRuntimePlugin@@YAXXZ) reference”
Where is EmptyLinkFunctionForStaticInitializationCreaturePackRuntimePlugin defined? Did you add to your dependency list in the build file?