Grails prod war not work

[liuxiaoyi]

Hi, When I run command : grails prod war , I received following error message: java.lang.NullPointerException: Cannot invoke method getAt() on null object at grails.util.BuildSettings.configureDependencyManager(BuildSettings.groovy:1259) at grails.util.BuildSettings$configureDependencyManager.callCurrent(Unknown Source) at grails.util.BuildSettings.postLoadConfig(BuildSettings.groovy:1170) at grails.util.BuildSettings.loadConfig(BuildSettings.groovy:1068) at grails.util.BuildSettings.loadConfig(BuildSettings.groovy:1050) at grails.util.BuildSettings$loadConfig.callCurrent(Unknown Source) at grails.util.BuildSettings.loadConfig(BuildSettings.groovy:1028) | Error There was an error loading the BuildConfig: Cannot invoke method getAt() on null object

Could you help me to understanding what's wrong with my envirement? (ubuntu1604 /jdk1.7/grails2.2.5)

by the way , when I try to download war file from dropbox directly , the page shows 404

thank you ! Eric Liu