C:\Users\Joseph Goldsmith\OneDrive\Desktop\hbm>gradlew build
:compileApiJava UP-TO-DATE
:processApiResources UP-TO-DATE
:apiClasses UP-TO-DATE
:sourceMainJava
:compileJava

FAILURE: Build failed with an exception.

• What went wrong:
  Could not resolve all dependencies for configuration ':compileClasspath'.

Could not find forgeSrc.jar (:forgeSrc:1.7.10-10.13.4.1558-1.7.10).
Searched in the following locations:
http://files.minecraftforge.net/maven//forgeSrc/1.7.10-10.13.4.1558-1.7.10/forgeSrc-1.7.10-10.13.4.1558-1.7.10.jar

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 23.885 secs

C:\Users\Joseph Goldsmith\OneDrive\Desktop\hbm>

If you need the stacktrace, then tell me.

About a week ago one of the files required to set up a 1.7 workspace was removed from the forge servers, so the current way no longer works. I'll change the readme in the near future after I'm done with the current update.