Using mozart.phar, getting "File Already Exists" error

[craigrileyuk]

        "mozart": {
            "dep_namespace": "MyNamespace\\MyProject\\Vendor\\",
            "dep_directory": "/src/Vendor/",
            "classmap_directory": "/classes_prefixed/",
            "classmap_prefix": "MNMP_",
            "packages": [
                "monolog/monolog",
                "illuminate/cache",
                "illuminate/config",
                "illuminate/container",
                "illuminate/database",
                "illuminate/pagination",
                "illuminate/view"
            ],
            "delete_vendor_directories": true
        },

Just trying to namespace a few basics and everytime I run compose I get File already exists src/Vendor/Illuminate/Support/LICENSE.md. I can't patch the phar since it invalidates the signature.