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

> ### 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  [18:13:28.853] Benchmark with 60 resampling iterations 
INFO  [18:13:29.117] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [18:13:29.182] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [18:13:29.208] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [18:13:29.234] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [18:13:29.273] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [18:13:29.300] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [18:13:29.325] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [18:13:29.351] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [18:13:29.377] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [18:13:29.403] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [18:13:29.428] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [18:13:29.913] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [18:13:30.552] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [18:13:31.051] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [18:13:31.542] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [18:13:31.936] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [18:13:32.288] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [18:13:32.726] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [18:13:33.134] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [18:13:33.633] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [18:13:34.070] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [18:13:34.096] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [18:13:34.121] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [18:13:34.187] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [18:13:34.212] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [18:13:34.238] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [18:13:34.262] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [18:13:34.301] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [18:13:34.409] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [18:13:34.437] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [18:13:34.462] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [18:13:34.510] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [18:13:34.557] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [18:13:34.603] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [18:13:34.664] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [18:13:34.711] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [18:13:34.759] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [18:13:34.806] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [18:13:34.890] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [18:13:34.990] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [18:13:35.037] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [18:13:35.061] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [18:13:35.086] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [18:13:35.111] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [18:13:35.135] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [18:13:35.159] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [18:13:35.244] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [18:13:35.270] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [18:13:35.296] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [18:13:35.322] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [18:13:35.347] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [18:13:35.423] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [18:13:35.516] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [18:13:35.592] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [18:13:35.684] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [18:13:35.771] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [18:13:35.847] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [18:13:35.924] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [18:13:36.022] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [18:13:36.209] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [18:13:36.300] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted