org.antlr.runtime.CommonToken cannot be cast to org.drools.lang.DroolsToken

I Got this Unexpected exception when put rule in a .drl file inside Eclipse (let me know you need something more):

Unexpected exception raised while parsing. This is a bug. Please contact the Development team :
java.lang.ClassCastException: org.antlr.runtime.CommonToken cannot be cast to org.drools.lang.DroolsToken
[org.drools.lang.ParserHelper.emit(ParserHelper.java:89), org.drools.lang.DRLParser.fact(DRLParser.java:9214), org.drools.lang.DRLParser.fact_binding_expression(DRLParser.java:9012), org.drools.lang.DRLParser.fact_binding(DRLParser.java:8890), org.drools.lang.DRLParser.lhs_pattern(DRLParser.java:8713), org.drools.lang.DRLParser.pattern_source(DRLParser.java:7017), org.drools.lang.DRLParser.lhs_unary(DRLParser.java:5846), org.drools.lang.DRLParser.lhs_and(DRLParser.java:5559), org.drools.lang.DRLParser.lhs_or(DRLParser.java:5249), org.drools.lang.DRLParser.lhs(DRLParser.java:5047), org.drools.lang.DRLParser.normal_lhs_block(DRLParser.java:4953), org.drools.lang.DRLParser.when_part(DRLParser.java:3217), org.drools.lang.DRLParser.rule(DRLParser.java:3009), org.drools.lang.DRLParser.statement(DRLParser.java:746), org.drools.lang.DRLParser.compilation_unit(DRLParser.java:340), org.drools.compiler.DrlParser.compile(DrlParser.java:231), org.drools.compiler.DrlParser.parse(DrlParser.java:71), org.drools.eclipse.DroolsEclipsePlugin.generateParsedResource(DroolsEclipsePlugin.java:416), org.drools.eclipse.DroolsEclipsePlugin.generateParsedResource(DroolsEclipsePlugin.java:361), org.drools.eclipse.DroolsEclipsePlugin.parseResource(DroolsEclipsePlugin.java:274), org.drools.eclipse.builder.DroolsBuilder.parseDRLFile(DroolsBuilder.java:279), org.drools.eclipse.builder.DroolsBuilder.parseResource(DroolsBuilder.java:191), org.drools.eclipse.builder.DroolsBuilder$DroolsBuildDeltaVisitor.visit(DroolsBuilder.java:155), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:68), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79), org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:48), org.drools.eclipse.builder.DroolsBuilder.incrementalBuild(DroolsBuilder.java:143), org.drools.eclipse.builder.DroolsBuilder.build(DroolsBuilder.java:101), org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629), org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42), org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172), org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:203), org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:255), org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42), org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:258), org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:311), org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:343), org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144), org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:242), org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)]