Grails错误无法创建bean，只能使用脚手架

Grails:2.4 Java:Oracle1.7 操作系统：Ubuntu 14.04 朋友们好,， 我正在进行一个示例项目，以提高我对grails的了解。对于控制器文件，当我将def index（）{}替换为 def scaffold=eventmanagement，我得到一个错误，下面提到了它的日志。如果我没有添加这一行，并且我转到localhost页面，那么我就看不到web应用程序正在运行。请告诉我该怎么做。非常感谢。 控制器文件为/grails-2.4.0/EventMg/grails-app/controllers/com/Evenmgmt.groovy。 日志：

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我通过干净地安装旧版本的Ubuntu解决了这个问题。同样的代码起作用。对我来说，这个问题的答案是正确的

| Running Grails application
| Error 2014-06-15 16:47:52,353 [localhost-startStop-1] ERROR context.GrailsContextLoaderListener  - Error initializing the application: Error creating bean with name 'com.tekdays.TekEventController': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.tekdays.TekEventController]: Constructor threw exception; nested exception is java.lang.NullPointerException
Message: Error creating bean with name 'com.tekdays.TekEventController': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.tekdays.TekEventController]: Constructor threw exception; nested exception is java.lang.NullPointerException
    Line | Method
->>  266 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1142 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    617 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by BeanInstantiationException: Could not instantiate bean class [com.tekdays.TekEventController]: Constructor threw exception; nested exception is java.lang.NullPointerException
->>  266 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1142 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    617 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
Caused by NullPointerException: null
->>  266 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1142 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    617 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    745 | run       in java.lang.Thread
| Error Forked Grails VM exited with error