URGENTE: Alguém pode me ajudar com esse ERRO

configurei o Hibernate e todas os jar e o persistence.xml tudo certo funcionou, mas hj abri o eclipse novamente e todas as classes estao com esse erro, inclusive as que ja funcionavam.

fev 20, 2017 8:11:35 PM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
fev 20, 2017 8:11:35 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.2.0.Final}
fev 20, 2017 8:11:35 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
fev 20, 2017 8:11:35 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Exception in thread "main" java.lang.ExceptionInInitializerError
    at br.com.alura.financas.util.PopulaConta.main(PopulaConta.java:15)
Caused by: javax.persistence.PersistenceException: Unable to configure EntityManagerFactory
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:386)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:71)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
    at br.com.alura.financas.util.JPAUtil.<clinit>(JPAUtil.java:8)
    ... 1 more
Caused by: java.lang.RuntimeException: Error while reading file:/G:/DESENVOLVIMENTO/eclipse%2032/eclipse/workspace/Financas/bin
    at org.hibernate.ejb.packaging.NativeScanner.getClassesInJar(NativeScanner.java:131)
    at org.hibernate.ejb.Ejb3Configuration.addScannedEntries(Ejb3Configuration.java:486)
    at org.hibernate.ejb.Ejb3Configuration.addMetadataFromScan(Ejb3Configuration.java:476)
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:362)
    ... 5 more
Caused by: java.io.IOException: invalid constant type: 18
    at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113)
    at javassist.bytecode.ConstPool.read(ConstPool.java:1056)
    at javassist.bytecode.ConstPool.<init>(ConstPool.java:150)
    at javassist.bytecode.ClassFile.read(ClassFile.java:765)
    at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)
    at org.hibernate.ejb.packaging.AbstractJarVisitor.checkAnnotationMatching(AbstractJarVisitor.java:246)
    at org.hibernate.ejb.packaging.AbstractJarVisitor.executeJavaElementFilter(AbstractJarVisitor.java:212)
    at org.hibernate.ejb.packaging.AbstractJarVisitor.addElement(AbstractJarVisitor.java:173)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:126)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
    at org.hibernate.ejb.packaging.ExplodedJarVisitor.doProcessElements(ExplodedJarVisitor.java:92)
    at org.hibernate.ejb.packaging.AbstractJarVisitor.getMatchingEntries(AbstractJarVisitor.java:149)
    at org.hibernate.ejb.packaging.NativeScanner.getClassesInJar(NativeScanner.java:128)
    ... 8 more