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Example code fails using xgboost

I tried to use mlrOverfit in an analysis using XGBoost.

library(mlrOverfit)

task = iris.task
learner =  makeLearner("classif.xgboost", predict.type = "prob")
par.set = makeParamSet(makeDiscreteParam("max_depth",values=c(4,5)))
tune.control = makeTuneControlRandom(maxit = 20)
learner.tuned = makeTuneWrapper(learner = learner, resampling = hout, par.set = par.set, control = tune.control)
ro = resampleOverfit(learner = learner.tuned, task = task, resampling = cv5)

outer.errors = calcOuterPerformances(ro)
outer.errors = simulateOuterPerformance(outer.errors)
gg = plot(outer.errors, ro)
gg + facet_grid(iter~.)

However calcOuterPerformances fails with the error message:

Error in calcOuterPerformances(ro) : 
  Assertion on 'df' failed: Must have class 'data.frame', but has class 'factor'.

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