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  [22:46:53.610] Benchmark with 60 resampling iterations 
INFO  [22:46:53.864] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:46:53.941] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:46:53.981] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:46:54.029] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:46:54.079] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:46:54.142] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:46:54.207] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:46:54.240] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:46:54.319] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:46:54.409] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:46:54.459] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:46:55.002] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:46:55.630] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:46:56.128] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:46:56.702] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:46:57.168] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:46:57.633] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:46:58.164] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:46:58.728] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:46:59.304] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:46:59.820] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:46:59.851] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:46:59.883] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:46:59.904] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:46:59.919] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:46:59.934] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:46:59.948] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:46:59.979] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:47:00.021] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:47:00.040] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:47:00.071] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:47:00.097] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:47:00.123] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:47:00.157] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:47:00.189] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:47:00.215] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:47:00.243] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:47:00.270] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:47:00.337] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:47:00.364] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:47:00.394] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:47:00.417] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:47:00.449] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:47:00.492] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:47:00.527] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:47:00.557] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:47:00.589] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:47:00.606] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:47:00.622] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:47:00.638] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:47:00.654] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:47:00.704] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:47:00.747] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:47:00.791] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:47:00.859] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:47:00.905] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:47:00.950] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:47:01.005] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:47:01.085] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:47:01.131] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:47:01.172] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted