```
java.lang.RuntimeException: Setting value cannot be null: {file:/home/travis/build/takezoe/gitbucket/}gitbucket/*:version
at scala.sys.package$.error(package.scala:27)
at sbt.EvaluateSettings$INode.setValue(INode.scala:143)
at sbt.EvaluateSettings$MixedNode.evaluate0(INode.scala:175)
```