Have you tried asking HBM ( @TheBobcat ) for a Bugfix? 
Also maybe try not to give ā?ā when it asks for a Number.
As for the Workspace did you try running the following in the Console inside the Directory the git workspace is?
On Windows (if i guessed right):
gradlew --refresh-dependencies setupDecompWorkspace build eclipse
On Linux
./gradlew --refresh-dependencies setupDecompWorkspace build eclipse