"Build failed" with Xcode 12.2

[flogy]

Could not build the project after manually installing the library in Xcode 12.2 as it is described in the README file. The build fails almost immediately after starting but does not show any error in the log.

[flogy]

I was able to solve it by installing the library as follows:

1. Open the project overview in Xcode and right click to Libraries, then click Add files to ....
2. Selecting the RnTestExceptionHandler.h and RnTestExceptionHandler.m files directly (not the project as described in the README).
3. Done.