I sometimes get this exception whenever i want to retrieve data from the database

WARN  [JDBCExceptionReporter] SQL Error: 0, SQLState: null
16:49:19,440 ERROR [JDBCExceptionReporter] Transaction is not active: tx=TransactionImple < ac, BasicAction: a6140a5:ed5:49f8bcb5:3e status: ActionStatus.ABORT_ONLY >; - nested throwable: (javax.resource.ResourceException: Transaction is not active: tx=TransactionImple < ac, BasicAction: a6140a5:ed5:49f8bcb5:3e status: ActionStatus.ABORT_ONLY >)

Any suggestion would be appreciated , I am using Jboss Seam 2.0 and Hibernate, the error occurs in my @create method