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  [17:33:28.011] Benchmark with 60 resampling iterations 
INFO  [17:33:28.189] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:33:28.255] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:33:28.299] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:33:28.343] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:33:28.388] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:33:28.440] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:33:28.495] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:33:28.540] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:33:28.590] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:33:28.637] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:33:28.680] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:33:29.260] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:33:29.627] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:33:30.182] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:33:30.734] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:33:31.126] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:33:31.262] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:33:31.420] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:33:31.562] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:33:31.701] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:33:32.318] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:33:32.338] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:33:32.358] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:33:32.378] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:33:32.397] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:33:32.422] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:33:32.442] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:33:32.461] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:33:32.481] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:33:32.500] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:33:32.519] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:33:32.595] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:33:32.648] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:33:32.684] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:33:32.728] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:33:32.769] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:33:32.858] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:33:32.895] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:33:32.932] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:33:32.969] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:33:33.006] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:33:33.026] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:33:33.052] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:33:33.071] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:33:33.091] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:33:33.110] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:33:33.129] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:33:33.148] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:33:33.167] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:33:33.187] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:33:33.217] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:33:33.276] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:33:33.343] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:33:33.406] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:33:33.470] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:33:33.599] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:33:33.706] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:33:33.763] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:33:33.875] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:33:33.983] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:33:34.112] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted