Getting an error when launching a Groovy app

I am getting the error below when launching a Groovy app from within IntelliJ 6.0.5. Also, the syntax highlighting does not work in the editor. Does anyone have any idea why this happens? Does the Groovy plugin work for anyone with Idea 6?
Thanks!

Original exception: com.intellij.openapi.compiler.ex.CompilerPathsEx.getCompilationClasspath(Lcom/intellij/openapi/module/Module;)Ljava/lang/String;
java.lang.NoSuchMethodError: com.intellij.openapi.compiler.ex.CompilerPathsEx.getCompilationClasspath(Lcom/intellij/openapi/module/Module;)Ljava/lang/String;
at org.codehaus.groovy.intellij.irida.IridaAPI.getCompilationClasspath(IridaAPI.java:35)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.createCompilationUnit(GroovyCompiler.java:132)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.createCompilationUnits(GroovyCompiler.java:116)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.findOrCreateCompilationUnits(GroovyCompiler.java:110)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.mapModulesToSourceAndTestCompilationUnits(GroovyCompiler.java:96)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.compile(GroovyCompiler.java:83)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.access$000(GroovyCompiler.java:49)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler$1.run(GroovyCompiler.java:74)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:271)
at org.codehaus.groovy.intellij.compiler.GroovyCompiler.compile(GroovyCompiler.java:72)
at com.intellij.compiler.impl.CompileDriver.a(CompileDriver.java:420)
at com.intellij.compiler.impl.CompileDriver.a(CompileDriver.java:653)
at com.intellij.compiler.impl.CompileDriver.a(CompileDriver.java:624)
at com.intellij.compiler.impl.CompileDriver.a(CompileDriver.java:73)
at com.intellij.compiler.impl.CompileDriver.access$400(CompileDriver.java:87)
at com.intellij.compiler.impl.CompileDriver$5$1.run(CompileDriver.java:0)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:51)
at com.intellij.compiler.impl.CompileDriver$5.run(CompileDriver.java:3)

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