021-07-29 17:54:53,796 WARN  [org.acm.sch.mes.TimeTableMessagingHandler] (ForkJoinPool.commonPool-worker-19) Error during processing a solver request (1).: org.drools.ancompiler.CouldNotCreateAlphaNetworkCompilerException: Cannot create Compiled Alpha Network
        at org.drools.ancompiler.CompiledNetworkSource.newCompiledNetworkInstance(CompiledNetworkSource.java:80)
        at org.drools.ancompiler.CompiledNetworkSource.createInstanceAndSet(CompiledNetworkSource.java:66)
        at org.drools.ancompiler.KieBaseUpdaterANC.lambda$inMemoryUpdate$0(KieBaseUpdaterANC.java:72)
        at java.base/java.util.HashMap$Values.forEach(HashMap.java:976)
        at org.drools.ancompiler.KieBaseUpdaterANC.inMemoryUpdate(KieBaseUpdaterANC.java:70)
        at org.drools.ancompiler.KieBaseUpdaterANC.run(KieBaseUpdaterANC.java:52)
        at org.drools.ancompiler.KieBaseUpdaterANC.generateAndSetInMemoryANC(KieBaseUpdaterANC.java:99)
        at org.optaplanner.core.impl.score.stream.drools.DroolsConstraintSessionFactory.buildKieBaseFromModel(DroolsConstraintSessionFactory.java:85)
        at org.optaplanner.core.impl.score.stream.drools.DroolsConstraintSessionFactory.buildSession(DroolsConstraintSessionFactory.java:126)
        at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirectorFactory.newConstraintStreamingSession(DroolsConstraintStreamScoreDirectorFactory.java:50)
        at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirector.resetConstraintStreamingSession(DroolsConstraintStreamScoreDirector.java:75)
        at org.optaplanner.core.impl.score.director.stream.DroolsConstraintStreamScoreDirector.setWorkingSolution(DroolsConstraintStreamScoreDirector.java:67)
        at org.optaplanner.core.impl.solver.scope.SolverScope.setWorkingSolutionFromBestSolution(SolverScope.java:215)
        at org.optaplanner.core.impl.solver.AbstractSolver.solvingStarted(AbstractSolver.java:80)
        at org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:200)
        at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:174)
        at org.acme.schooltimetabling.messaging.TimeTableMessagingHandler.lambda$solve$0(TimeTableMessagingHandler.java:79)
        at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736)
        at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1728)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: java.lang.NoSuchMethodException: org.drools.ancompiler.Compiledorg_acme_schooltimetabling_domain_LessonNetwork31008790748.<init>(org.drools.core.spi.InternalReadAccessor, java.util.Map)
        at java.base/java.lang.Class.getConstructor0(Class.java:3349)
        at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2553)
        at org.drools.ancompiler.CompiledNetworkSource.newCompiledNetworkInstance(CompiledNetworkSource.java:77)
        ... 23 more