dub getting stuck

[Joel]

macOS 10.13.6
dmd 2.085.0
dub 1.3.0

{
     "name": "server",
     "targetType": "executable",
     "description": "A testing D application.",
     "sourcePaths" : ["source"],
     "dependencies":
     {
		"vibe-d" : "~>0.8.0"
     }
}

void main()
{
     import vibe.d;
     listenHTTP(":8080", (req, res) {
         res.writeBody("Hello, World: " ~ req.path);
     });
     runApplication();
}

>dub -v
>..
>Sub package vibe-d:diet doesn't exist in vibe-d 0.8.1-alpha.1.

(gets as far as that line?!)

On another program, it gets stuck in a completely different 
situation.