title: ant throwing an error "java returned 1"
body: <p>So I am trying to build a repository and on using "ANT", i get the following error:</p>
  
  <pre><code>Copying 1851 files to F:\GitHub\appinventor-sources\appinventor\appengine\build\war         CheckYaClientApp: YaClientApp: 
  [java] Jan 14, 2015 10:33:52 AM java.util.prefs.WindowsPreferences 
  [java] WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5. 
  [java] Compiling module com.google.appinventor.YaClient 
  [java] [ERROR] Unexpected internal compiler error 
  [java] java.lang.RuntimeException: Unable to write to byte cache 
  [java] at com.google.gwt.dev.util.DiskCache.writeByteArray(DiskCache.java:219) 
  [java] at com.google.gwt.dev.javac.CompiledClass.(CompiledClass.java:106) 
  [java] at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.createCompiledClass(JdtCompiler.java:266) 
  [java] at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:239) 
  [java] at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:444) 
  [java] at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:718) 
  [java] at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:248) 
  [java] at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:463) 
  [java] at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:388) 
  [java] at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:373) 
  [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:246) 
  [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:229) 
  [java] at com.google.gwt.dev.Precompile.precompile(Precompile.java:141) 
  [java] at com.google.gwt.dev.Compiler.run(Compiler.java:232) 
  [java] at com.google.gwt.dev.Compiler.run(Compiler.java:198) 
  [java] at com.google.gwt.dev.Compiler$1.run(Compiler.java:170) 
  [java] at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88) 
  [java] at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger (CompileTaskRunner.java:82) 
  [java] at com.google.gwt.dev.Compiler.main(Compiler.java:177) 
  [java] Caused by: java.io.IOException: There is not enough space on the disk 
  [java] at java.io.RandomAccessFile.writeBytes0(Native Method) 
  [java] at java.io.RandomAccessFile.writeBytes(RandomAccessFile.java:520 ) 
  [java] at java.io.RandomAccessFile.write(RandomAccessFile.java:537) 
  [java] at com.google.gwt.dev.util.DiskCache.writeByteArray(DiskCache.ja va:216) 
  [java] ... 18 more BUILD FAILED
  
  F:\GitHub\appinventor-sources\appinventor\build.xml:16: The following error occu rred while executing this line: F:\GitHub\appinventor-sources\appinventor\appengine\build.xml:364: Java returned : 1
  </code></pre>
  
  <p>What am I missing?</p>