Param Synth for bees 20 did not finish *CASE STUDY*

[xhajnal]

java.lang.NullPointerException
at edu.jas.ufd.Quotient.(Quotient.java:105)
at edu.jas.ufd.Quotient.sum(Quotient.java:350)
at param.JasFunction.add(JasFunction.java:142)
at param.CachedFunctionFactory.add(CachedFunctionFactory.java:207)
at param.CachedFunction.add(CachedFunction.java:86)
at param.MutablePMC.addTransition(MutablePMC.java:130)
at param.StateEliminator.eliminate(StateEliminator.java:396)
at param.StateEliminator.eliminate(StateEliminator.java:292)
at param.ValueComputer.computeValues(ValueComputer.java:731)
at param.ValueComputer.computeUnboundedMC(ValueComputer.java:307)
at param.ValueComputer.computeUnbounded(ValueComputer.java:286)
at param.ValueComputer.computeUnbounded(ValueComputer.java:261)
at param.ParamModelChecker.checkProbUntil(ParamModelChecker.java:976)
at param.ParamModelChecker.checkProbPathFormulaSimple(ParamModelChecker.java:959)
at param.ParamModelChecker.checkExpressionProb(ParamModelChecker.java:911)
at param.ParamModelChecker.checkExpression(ParamModelChecker.java:391)
at param.ParamModelChecker.checkExpressionFilter(ParamModelChecker.java:544)
at param.ParamModelChecker.checkExpression(ParamModelChecker.java:388)
at param.ParamModelChecker.check(ParamModelChecker.java:256)
at prism.Prism.modelCheckParametric(Prism.java:3243)
at prism.PrismCL.run(PrismCL.java:377)
at prism.PrismCL.go(PrismCL.java:210)
at prism.PrismCL.main(PrismCL.java:2523)

Error: Caught unhandled exception, aborting....