Error building in xcode

I need help, apparently there is no problem when I compile the project in Unity 2019.2.16f but when I try to archive in xcode I get this error (It doesn't happen with Unity 2019.3.0f3 but updating is not a viable option):

In file included from /Users/xxpleyxx/Desktop/iOS/Classes/Native/mscorlib23.cpp:20:

In file included from /Users/xxpleyxx/Desktop/iOS/Libraries/libil2cpp/include/mono/ThreadPool/threadpool-ms.h:5:

In file included from /Users/xxpleyxx/Desktop/iOS/Libraries/libil2cpp/include/mono/ThreadPool/ThreadPoolDataStructures.h:5:

In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:275:

In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:16:

In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:645:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:2456:46: error: expected unqualified-id

/* _LIBCPP_INLINE_VAR */ constexpr __ph<9>   _9{};

                                             ^

<built-in>:423:12: note: expanded from here

#define _9 1

           ^