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  [21:36:25.045] Benchmark with 60 resampling iterations 
INFO  [21:36:25.244] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [21:36:25.312] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [21:36:25.353] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [21:36:25.389] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [21:36:25.426] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [21:36:25.462] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [21:36:25.500] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [21:36:25.554] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [21:36:25.593] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [21:36:25.619] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [21:36:25.672] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [21:36:25.936] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [21:36:26.407] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [21:36:26.578] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [21:36:26.882] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [21:36:27.038] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [21:36:27.437] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [21:36:27.874] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [21:36:28.329] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [21:36:28.771] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [21:36:29.065] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [21:36:29.089] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [21:36:29.114] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [21:36:29.138] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [21:36:29.161] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [21:36:29.198] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [21:36:29.250] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [21:36:29.301] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [21:36:29.349] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [21:36:29.400] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [21:36:29.448] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [21:36:29.536] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [21:36:29.613] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [21:36:29.658] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [21:36:29.705] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [21:36:29.748] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [21:36:29.801] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [21:36:29.842] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [21:36:29.882] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [21:36:29.920] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [21:36:29.959] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [21:36:29.980] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [21:36:30.000] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [21:36:30.020] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [21:36:30.044] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [21:36:30.064] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [21:36:30.085] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [21:36:30.106] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [21:36:30.132] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [21:36:30.156] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [21:36:30.205] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [21:36:30.270] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [21:36:30.341] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [21:36:30.401] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [21:36:30.461] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [21:36:30.522] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [21:36:30.588] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [21:36:30.659] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [21:36:30.765] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [21:36:30.877] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [21:36:30.941] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted