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  [11:25:52.031] Benchmark with 60 resampling iterations 
INFO  [11:25:52.279] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [11:25:52.361] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [11:25:52.388] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [11:25:52.416] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [11:25:52.444] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [11:25:52.487] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [11:25:52.515] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [11:25:52.543] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [11:25:52.580] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [11:25:52.608] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [11:25:52.636] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [11:25:53.069] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [11:25:53.451] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [11:25:53.896] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [11:25:54.340] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [11:25:54.704] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [11:25:55.045] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [11:25:55.447] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [11:25:55.818] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [11:25:56.181] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [11:25:56.553] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [11:25:56.580] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [11:25:56.607] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [11:25:56.634] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [11:25:56.662] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [11:25:56.689] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [11:25:56.716] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [11:25:56.743] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [11:25:56.770] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [11:25:56.813] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [11:25:56.842] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [11:25:56.892] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [11:25:56.943] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [11:25:56.990] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [11:25:57.038] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [11:25:57.098] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [11:25:57.147] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [11:25:57.194] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [11:25:57.242] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [11:25:57.290] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [11:25:57.352] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [11:25:57.377] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [11:25:57.403] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [11:25:57.428] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [11:25:57.454] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [11:25:57.497] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [11:25:57.524] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [11:25:57.552] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [11:25:57.580] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [11:25:57.689] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [11:25:57.718] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [11:25:57.799] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [11:25:57.886] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [11:25:57.980] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [11:25:58.058] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [11:25:58.135] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [11:25:58.228] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [11:25:58.305] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [11:25:58.381] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [11:25:58.477] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [11:25:58.558] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted