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  [17:33:46.010] Benchmark with 60 resampling iterations 
INFO  [17:33:46.178] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:33:46.253] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:33:46.295] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:33:46.350] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:33:46.418] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:33:46.460] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:33:46.495] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:33:46.536] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:33:46.593] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:33:46.637] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:33:46.713] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:33:47.138] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:33:47.654] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:33:48.202] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:33:48.361] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:33:48.852] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:33:49.051] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:33:49.284] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:33:49.778] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:33:50.063] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:33:50.372] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:33:50.391] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:33:50.410] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:33:50.431] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:33:50.451] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:33:50.475] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:33:50.495] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:33:50.513] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:33:50.532] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:33:50.551] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:33:50.571] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:33:50.605] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:33:50.646] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:33:50.682] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:33:50.716] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:33:50.752] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:33:50.825] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:33:50.860] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:33:50.895] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:33:50.930] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:33:50.978] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:33:51.011] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:33:51.032] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:33:51.052] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:33:51.073] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:33:51.093] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:33:51.114] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:33:51.133] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:33:51.153] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:33:51.177] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:33:51.196] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:33:51.253] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:33:51.308] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:33:51.371] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:33:51.428] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:33:51.489] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:33:51.545] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:33:51.600] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:33:51.671] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:33:51.726] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:33:51.784] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted