Erro ao executar glassfish e a aplicação

Ola colegas,
estou com um erro ao iniciar o glassfish de a seguinte mensagem de erro:

SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method


SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method
javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [EcommerceDevmediaPU] failed.
Internal Exception: Exception [EclipseLink-7154] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The attribute [sells] in entity class [class br.com.devmedia.entity.CreditCard] has a mappedBy value of [creditcard] which does not exist in its owning entity class [class br.com.devmedia.entity.Sell]. If the owning entity class is a @MappedSuperclass, this is invalid, and your attribute should reference the correct subclass.
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:991)
        at org.eclipse.persistence.jpa.PersistenceProvider.createContainerEntityManagerFactory(PersistenceProvider.java:202)
        at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:181)
        at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:96)
        at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:121)
        at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:644)
        at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:296)
        at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
        at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224)
        at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:365)
        at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:204)
        at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:166)
        at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:100)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:245)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [EcommerceDevmediaPU] failed.
Internal Exception: Exception [EclipseLink-7154] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The attribute [sells] in entity class [class br.com.devmedia.entity.CreditCard] has a mappedBy value of [creditcard] which does not exist in its owning entity class [class br.com.devmedia.entity.Sell]. If the owning entity class is a @MappedSuperclass, this is invalid, and your attribute should reference the correct subclass.
        at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
        ... 34 more
Caused by: Exception [EclipseLink-7154] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The attribute [sells] in entity class [class br.com.devmedia.entity.CreditCard] has a mappedBy value of [creditcard] which does not exist in its owning entity class [class br.com.devmedia.entity.Sell]. If the owning entity class is a @MappedSuperclass, this is invalid, and your attribute should reference the correct subclass.
        at org.eclipse.persistence.exceptions.ValidationException.noMappedByAttributeFound(ValidationException.java:1313)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.RelationshipAccessor.getOwningMapping(RelationshipAccessor.java:298)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.OneToManyAccessor.processOneToManyMapping(OneToManyAccessor.java:168)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.OneToManyAccessor.process(OneToManyAccessor.java:111)
        at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.RelationshipAccessor.processRelationship(RelationshipAccessor.java:546)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processRelationshipAccessors(MetadataProject.java:1085)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage3(MetadataProject.java:1364)
        at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:462)
        at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:390)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:945)
        ... 33 more

No caso do projeto ao executar acontece o erro:

deploy?path=C:\Devmedia\EcommerceDevmedia\build\web&name=EcommerceDevmedia&force=true failed on GlassFish DevMedia
C:\Devmedia\EcommerceDevmedia\nbproject\build-impl.xml:684: The module has not been deployed.

init:
deps-module-jar:
deps-ear-jar:
deps-jar:
library-inclusion-in-archive:
library-inclusion-in-manifest:
compile:
compile-jsps:
In-place deployment at C:\Devmedia\EcommerceDevmedia\build\web
Initializing...
deploy?path=C:\Devmedia\EcommerceDevmedia\build\web&name=EcommerceDevmedia&force=true failed on GlassFish DevMedia
C:\Devmedia\EcommerceDevmedia\nbproject\build-impl.xml:684: The module has not been deployed.
BUILD FAILED (total time: 7 seconds)

Alguem poderia me ajudar a resolver?

Terial alguem que poderia me dar uma ajuda para resolver este problema?

Alguem poderia me ajudar, não consigo fazer deploy devido a esses problemas.
Muito obrigado desde já!!

Colegas, por favor,
alguem ja teve esse problema e poderia me dar uma ajuda?