[rules-users] NoMuchMethod - But there is!

Hello, I downloaded the JBoss Rules 4.0 Eclipse IDE. I built a small project with about 120 rules. My test asserts around 500 objects. When I try to add one more rule (regardless of the content of the rule) I get the error below, stating no such method error. Even if I add the following rule, I still get the error: rule "new rule" when Object() then System.out.print("test"); end What other problems can throw these errors? Thanks, Steven -- Steven E. Waldren, M.D., M.S. OpenHealth Data Skype: steven.waldren ======= THE ERROR ========== java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems() [Lorg/eclipse/jdt/core/compiler/CategorizedProblem; at org.apache.commons.jci.compilers.EclipseJavaCompiler $2.acceptResult(EclipseJavaCompiler.java:295) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java: 454) at org.apache.commons.jci.compilers.EclipseJavaCompiler.compile (EclipseJavaCompiler.java:332) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll (JavaDialect.java:311) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java: 237) at org.drools.compiler.PackageBuilder.addPackageFromDrl (PackageBuilder.java:157) at com.sample.DroolsTest.readRule(DroolsTest.java:78) at com.sample.DroolsTest.main(DroolsTest.java:37) java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems() [Lorg/eclipse/jdt/core/compiler/CategorizedProblem; at org.apache.commons.jci.compilers.EclipseJavaCompiler $2.acceptResult(EclipseJavaCompiler.java:295) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java: 454) at org.apache.commons.jci.compilers.EclipseJavaCompiler.compile (EclipseJavaCompiler.java:332) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll (JavaDialect.java:311) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java: 237) at org.drools.compiler.PackageBuilder.addPackageFromDrl (PackageBuilder.java:157) at com.sample.DroolsTest.readRule(DroolsTest.java:78) at com.sample.DroolsTest.main(DroolsTest.java:37)