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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### 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  [22:49:51.276] Benchmark with 60 resampling iterations 
INFO  [22:49:51.447] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:49:51.521] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:49:51.569] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:49:51.617] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:49:51.652] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:49:51.686] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:49:51.721] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:49:51.754] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:49:51.789] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:49:51.829] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:49:51.879] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:49:52.495] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:49:53.026] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:49:53.201] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:49:53.620] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:49:53.838] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:49:54.261] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:49:54.793] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:49:55.280] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:49:55.832] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:49:56.370] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:49:56.401] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:49:56.432] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:49:56.462] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:49:56.485] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:49:56.516] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:49:56.547] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:49:56.578] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:49:56.613] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:49:56.644] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:49:56.675] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:49:56.745] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:49:56.795] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:49:56.826] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:49:56.915] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:49:56.959] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:49:57.017] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:49:57.077] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:49:57.174] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:49:57.217] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:49:57.276] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:49:57.307] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:49:57.334] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:49:57.364] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:49:57.377] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:49:57.429] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:49:57.460] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:49:57.490] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:49:57.505] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:49:57.535] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:49:57.566] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:49:57.658] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:49:57.737] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:49:57.824] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:49:57.884] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:49:57.923] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:49:57.967] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:49:58.005] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:49:58.046] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:49:58.140] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:49:58.212] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted