Please, tell me how can I solve my problem. When I get such output, what does it mean?

```
julia@julia-Aspire-5680 ~/zagruzchik $ java Loader3 HelloWorld 0    
Exception in thread "main" java.lang.ClassFormatError: Truncated class   file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
at Loader4.runClass(Loader3.java:52)
    at Loader3.main(Loader3.java:10)    

```