That line is emitted at ‘Log’ level, which might be filtered out before it reaches the file. 0x80070057 is a credible code though - it is of course ‘invalid parameter’.
One thought on where this might be coming from - the EraAdapter library has some dependencies on the public interface exposed by XSAPI. It may need a rebuild to pick up changes in the new Live SDK version you’re using. The vcxproj is part of the fork in the OnlineSubsystemLive/ThirdParty/EraAdapter/Source folder, but it will need some tweaking to account for that XSAPI path change you ran into earlier. If you get a building version, you should drop the output .dll and .winmd in the OnlineSubsystemLive/ThirdParty/EraAdapter/Binaries/UWPxx folders.