Error message is fixed (will be in the next RC): 845eea8
The error itself will vanish once #238 is implemented (planned for 0.9.22). The root cause is that ddb requires vibe.d ~master, while >= 0.7.19-beta.2 is requested here. Currently this is a conflict, but it is planned that this will resolve to ~master.
Thank you very much, really appreciated.
Paolo