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  [08:16:35.421] Benchmark with 60 resampling iterations 
INFO  [08:16:36.182] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [08:16:36.267] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [08:16:36.312] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [08:16:36.348] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [08:16:36.385] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [08:16:36.435] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [08:16:36.479] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [08:16:36.536] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [08:16:36.576] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [08:16:36.617] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [08:16:36.655] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [08:16:36.938] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [08:16:37.238] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [08:16:37.479] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [08:16:37.820] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [08:16:38.052] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [08:16:38.313] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [08:16:38.526] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [08:16:38.702] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [08:16:39.100] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [08:16:39.340] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [08:16:39.365] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [08:16:39.390] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [08:16:39.416] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [08:16:39.440] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [08:16:39.465] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [08:16:39.490] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [08:16:39.514] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [08:16:39.539] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [08:16:39.914] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [08:16:39.971] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [08:16:40.030] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [08:16:40.090] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [08:16:40.148] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [08:16:40.200] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [08:16:40.245] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [08:16:40.297] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [08:16:40.337] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [08:16:40.377] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [08:16:40.418] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [08:16:40.458] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [08:16:40.481] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [08:16:40.504] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [08:16:40.526] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [08:16:40.549] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [08:16:40.571] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [08:16:40.594] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [08:16:40.616] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [08:16:40.638] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [08:16:40.661] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [08:16:40.683] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [08:16:40.748] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [08:16:40.821] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [08:16:40.884] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [08:16:40.949] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [08:16:41.014] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [08:16:41.078] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [08:16:41.142] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [08:16:41.208] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [08:16:41.281] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [08:16:41.351] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted