Running examples in ‘mlr3viz-Ex.R’ failed
The error most likely occurred in:

> ### Name: autoplot.BenchmarkResult
> ### Title: Plot for BenchmarkResult
> ### Aliases: autoplot.BenchmarkResult
> 
> ### ** Examples
> 
> library(mlr3)
> library(mlr3viz)
> 
> tasks = tsks(c("spam", "pima", "sonar"))
> learner = lrns(c("classif.featureless", "classif.rpart"),
+   predict_type = "prob")
> resampling = rsmps("cv")
> object = benchmark(benchmark_grid(tasks, learner, resampling))
INFO  [10:29:48.266] Benchmark with 60 resampling iterations 
INFO  [10:29:48.511] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [10:29:48.582] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [10:29:48.612] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [10:29:48.643] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [10:29:48.691] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [10:29:48.721] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [10:29:48.750] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [10:29:48.781] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [10:29:48.815] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [10:29:48.850] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [10:29:48.886] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [10:29:49.322] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [10:29:49.668] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [10:29:50.063] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [10:29:50.455] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [10:29:50.791] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [10:29:51.154] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [10:29:51.535] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [10:29:51.906] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [10:29:52.261] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [10:29:52.638] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [10:29:52.665] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [10:29:52.691] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [10:29:52.718] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [10:29:52.745] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [10:29:52.772] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [10:29:52.798] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [10:29:52.843] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [10:29:52.870] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [10:29:52.897] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [10:29:52.924] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [10:29:52.976] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [10:29:53.030] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [10:29:53.079] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [10:29:53.144] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [10:29:53.214] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [10:29:53.265] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [10:29:53.313] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [10:29:53.360] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [10:29:53.423] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [10:29:53.474] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [10:29:53.500] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [10:29:53.526] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [10:29:53.552] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [10:29:53.577] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [10:29:53.602] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [10:29:53.696] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [10:29:53.723] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [10:29:53.748] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [10:29:53.774] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [10:29:53.800] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [10:29:53.879] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [10:29:53.972] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [10:29:54.050] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [10:29:54.128] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [10:29:54.221] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [10:29:54.300] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [10:29:54.377] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [10:29:54.472] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [10:29:54.554] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [10:29:54.654] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted