dex反编译jar后，只看到方法名，看不到方法的实现，抛了很多错，
java.lang.NullPointerException
        at com.googlecode.dex2jar.v3.IrMethod2AsmMethod.reBuildInstructions(IrMethod2AsmMethod.java:425)
        at com.googlecode.dex2jar.v3.IrMethod2AsmMethod.convert(IrMethod2AsmMethod.java:360)
        at com.googlecode.dex2jar.v3.V3MethodAdapter.visitEnd(V3MethodAdapter.java:232)
        at com.googlecode.dex2jar.v3.V3ClassAdapter$2.visitEnd(V3ClassAdapter.java:317)
        at com.googlecode.dex2jar.reader.DexFileReader.acceptMethod(DexFileReader.java:696)
        at com.googlecode.dex2jar.reader.DexFileReader.acceptClass(DexFileReader.java:441)
        at com.googlecode.dex2jar.reader.DexFileReader.accept(DexFileReader.java:328)
        at com.googlecode.dex2jar.v3.Dex2jar.doTranslate(Dex2jar.java:84)
        at com.googlecode.dex2jar.v3.Dex2jar.to(Dex2jar.java:239)
        at com.googlecode.dex2jar.v3.Dex2jar.to(Dex2jar.java:230)
        at com.googlecode.dex2jar.v3.Main.doData(Main.java:43)
        at com.googlecode.dex2jar.v3.Main.doData(Main.java:35)
        at com.googlecode.dex2jar.v3.Main.doFile(Main.java:63)
        at com.googlecode.dex2jar.v3.Main.main(Main.java:86)

DexMethodVisitor mv=cv.visitMethod(ACC_PUBLIC|ACC_CONSTRUCTOR, new Method("La/a/a;","<init>",new String[]{ },"V"));
DexCodeVisitor code = mv.visitCode();
code.visitArguments(1,new int[]{ 0});
code.visitEnd();
mv.visitEnd();

是不是修复dex文件，要怎么修复，求大大帮忙或者提供思路，下面是我要反编译的calasses.dex和反编译过来的jar文件。

calasses.zip

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上传的附件：

• calasses.zip （689.85kb，16次下载）