该模块尚未部署[Glassfish 4.0]

Question

我是EJB新手并尝试创建EJB应用程序。但是在创建实体类和会话类之后部署项目时，我收到以下错误...

Initial deploying contact to F:\JavaAptech\contact\dist\gfdeploy\contact
Completed initial distribution of contact
GlassFish Server 4, deploy, null, false
F:\JavaAptech\contact\nbproject\build-impl.xml:307: The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 1 second)

任何人都可以帮助我吗？