regading deployment in weblogic 8,1

hi all,

while deploying the application i am getting this excepiton.

Exception:weblogic.management.ApplicationException: prepare failed for
decevalweblogic.jar Module: decevalweblogic.jar Error: Exception preparing
module: EJBModule(decevalweblogic.jar,status=NEW) Unable to deploy EJB:
C:\beaweblogic\weblogic81\samples\domains\examples\.\examplesServer\.wlnotdelete
\deceval\decevalweblogic.jar from decevalweblogic.jar:
weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class
specified in your ejb-jar.xml: Class bytes found but defineClass()failed for:
'com.deceval.siidj.siidserver.ParametrosObj' at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploym
entInfoImpl.java:550) at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfo
Impl.java:232) at
weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1302) at
weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:498) at
weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.ja
va:3101) at
weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.j
ava:1560) at
weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:120
8) at
weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:105
1) at
weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareCont
ainer(SlaveDeployer.java:2444) at
weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(Slav
eDeployer.java:2394) at
weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeploye
r.java:2310) at
weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.
java:866) at
weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:5
94) at
weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:
508) at
weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:2
5) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219) at
weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)

    * [Deployer:149033]preparing application deceval on examplesServer
    * [Deployer:149033]failed application deceval on examplesServer
    * [Deployer:149034]An exception occurred for task [Deployer:149026]Deploy
application deceval on examplesServer.:
Exception:weblogic.management.ApplicationException: prepare failed for
decevalweblogic.jar Module: decevalweblogic.jar Error: Exception preparing
module: EJBModule(decevalweblogic.jar,status=NEW) Unable to deploy EJB:
C:\beaweblogic\weblogic81\samples\domains\examples\.\examplesServer\.wlnotdelete
\deceval\decevalweblogic.jar from decevalweblogic.jar:
weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class
specified in your ejb-jar.xml: Class bytes found but defineClass()failed for:
'com.deceval.siidj.siidserver.ParametrosObj' at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploym
entInfoImpl.java:550) at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfo
Impl.java:232) at
weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1302) at
weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:498) at
weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.ja
va:3101) at
weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.j
ava:1560) at
weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:120
8) at
weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:105
1) at
weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareCont
ainer(SlaveDeployer.java:2444) at
weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(Slav
eDeployer.java:2394) at
weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeploye
r.java:2310) at
weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.
java:866) at
weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:5
94) at
weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:
508) at
weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:2
5) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219) at
weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178) .

please help me
thanks in advance