Caused by: java.lang.IllegalArgumentException: The entity (Kiev) was never added to this ScoreDirector.
Maybe that specific instance is not in the return values of the PlanningSolution's entity members ([visitList]).
	at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.update(DroolsScoreDirector.java:197)
	at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.afterVariableChanged(DroolsScoreDirector.java:186)
	at org.optaplanner.core.impl.score.director.AbstractScoreDirector.changeVariableFacade(AbstractScoreDirector.java:434)
	at org.optaplanner.core.impl.heuristic.selector.move.generic.chained.ChainedChangeMove.doMoveOnGenuineVariables(ChainedChangeMove.java:70)
	at org.optaplanner.core.impl.heuristic.move.AbstractMove.doMove(AbstractMove.java:40)
	at org.optaplanner.core.impl.heuristic.move.AbstractMove.doMove(AbstractMove.java:30)
	at org.optaplanner.core.impl.score.director.AbstractScoreDirector.doAndProcessMove(AbstractScoreDirector.java:175)
	at org.optaplanner.core.impl.heuristic.thread.MoveThreadRunner.run(MoveThreadRunner.java:145)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)