[html5]malformed Unicode character escape sequence

This seems like a duplicate of Html5 package and launch failed - Platform & Builds - Epic Developer Community Forums ? Let’s focus the conversation there.

With errors like these, it is also useful to upload the build and the source project somewhere, if others might be able to reproduce and debug.

I created a project with base c++,and the code is copy with the help document of UE4(floating Actor).When I build the project it success in solution platform of html5but when I open it with FixFox,these errors happen

I want to know where the problem?