error in install

```
$ git clone https://github.com/swift-lang/swift-k.git swift-0.96
$ cd swift-0.96
$ ant redist
Buildfile: build.xml

cleanGenerated:

BUILD FAILED
/home/python/sf_box/swift-0.96/build.xml:415: Directory does not exist:/home/python/sf_box/swift-0.96/src/org/griphyn/vdl/model

Total time: 0 seconds src/org/griphyn/vdl/model
```

Do I need make new model folder ?
