构建时的UNEXPECTED TOP-LEVEL EXCEPTION异常

使用hudson进行android项目的构建时，在执行ant脚本到dex标签时，出现如下错误：

dex:
 [echo] Converting compiled files and external libraries into bin/classes.dex...
[apply]
[apply] UNEXPECTED TOP-LEVEL EXCEPTION:
[apply] com.android.dex.util.ExceptionWithContext
[apply]     at com.android.dex.util.ExceptionWithContext.withContext(ExceptionWithContext.java:45)
[apply]     at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:377)
[apply]     at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:139)
[apply]     at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:94)
[apply]     at com.android.dx.command.dexer.Main.processClass(Main.java:682)
[apply]     at com.android.dx.command.dexer.Main.processFileBytes(Main.java:634)
[apply]     at com.android.dx.command.dexer.Main.access$600(Main.java:78)
[apply]     at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:572)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:170)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.processDirectory(ClassPathOpener.java:229)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:158)
[apply]     at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
[apply]     at com.android.dx.command.dexer.Main.processOne(Main.java:596)
[apply]     at com.android.dx.command.dexer.Main.processAllFiles(Main.java:498)
[apply]     at com.android.dx.command.dexer.Main.runMonoDex(Main.java:264)
[apply]     at com.android.dx.command.dexer.Main.run(Main.java:230)
[apply]     at com.android.dx.command.dexer.Main.main(Main.java:199)
[apply]     at com.android.dx.command.Main.main(Main.java:103)
[apply] Caused by: java.lang.NullPointerException
[apply]     at com.android.dx.cf.code.ConcreteMethod.<init>(ConcreteMethod.java:87)
[apply]     at com.android.dx.cf.code.ConcreteMethod.<init>(ConcreteMethod.java:75)
[apply]     at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:277)
[apply]     ... 16 more
[apply] ...while processing run ()V
[apply] ...while processing ji$1.class

求大神帮助，在线等。谢谢

一般是各模块引用了相同的jar包的不同的版本引起的，统一版本即可。