weblogic.utils.AssertionError

[youngsun lee]

i'm getting an weblogics.utils.AssertionError when i'm trying to deploy my EJB Session Bean.
Can Anyone help?
Error message follows
=========================================================================
ERROR: Error from ejbc: weblogic.utils.AssertionError: ***** ASSERTION FAILED **
***[ Couldn't find wlBean named ServiceMgrAdapter ]
at weblogic.utils.Debug.assert(Debug.java:84)
at weblogic.ejb20.deployer.CompositeMBeanDescriptor.completeBeans(Compos
iteMBeanDescriptor.java:1285)
at weblogic.ejb20.deployer.CompositeMBeanDescriptor.init(CompositeMBeanD
escriptor.java:169)
at weblogic.ejb20.deployer.CompositeMBeanDescriptor.<init>(CompositeMBea
nDescriptor.java:156)
at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(M
BeanDeploymentInfoImpl.java:393)
at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymen
tInfoImpl.java:126)
at weblogic.ejb20.ejbc.EJBCompiler.setupEJB(EJBCompiler.java:130)
at weblogic.ejbc20.runBody(ejbc20.java:360)
at weblogic.utils.compiler.Tool.run(Tool.java:79)
at weblogic.ejbc.main(ejbc.java:29)