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  [22:59:48.515] Benchmark with 60 resampling iterations 
INFO  [22:59:48.767] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:59:48.841] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:59:48.883] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:59:48.924] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:59:48.958] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:59:49.021] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:59:49.070] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:59:49.105] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:59:49.139] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:59:49.193] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:59:49.257] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:59:49.826] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:59:50.387] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:59:50.911] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:59:51.423] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:59:52.001] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:59:52.574] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:59:53.191] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:59:53.746] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:59:54.229] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:59:54.719] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:59:54.751] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:59:54.782] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:59:54.814] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:59:54.863] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:59:54.895] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:59:54.926] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:59:54.942] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:59:54.965] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:59:54.983] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:59:54.999] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:59:55.030] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:59:55.057] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:59:55.084] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:59:55.117] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:59:55.161] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:59:55.221] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:59:55.280] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:59:55.346] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:59:55.374] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:59:55.403] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:59:55.420] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:59:55.436] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:59:55.452] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:59:55.469] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:59:55.491] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:59:55.531] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:59:55.562] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:59:55.593] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:59:55.625] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:59:55.662] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:59:55.761] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:59:55.829] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:59:55.872] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:59:55.953] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:59:56.042] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:59:56.127] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:59:56.212] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:59:56.293] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:59:56.386] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:59:56.467] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted