on macOS: std.json.JSONException@std/json.d(155): JSONValue is not a string

[shove70]

in dub.json:

{
	"name" : "d_test007",
	"description" : "Hello World - A minimal DUB bundle.",
	"dependencies" : {
		"vibe-core": "1.6.2"
	}
}

in src/app.d:

import vibe.core.log;

void main()
{
}

Compile and run it, output:
std.json.JSONException@std/json.d(155): JSONValue is not a string

DMD: 2.084.0, 2.085.0, 2.085.1
OS: MacOS 10.14.3