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  [10:16:23.157] Benchmark with 60 resampling iterations 
INFO  [10:16:23.382] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [10:16:23.467] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [10:16:23.506] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [10:16:23.535] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [10:16:23.561] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [10:16:23.583] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [10:16:23.603] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [10:16:23.623] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [10:16:23.647] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [10:16:23.677] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [10:16:23.700] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [10:16:23.888] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [10:16:24.190] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [10:16:24.472] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [10:16:24.667] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [10:16:24.957] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [10:16:25.244] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [10:16:25.520] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [10:16:25.846] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [10:16:26.055] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [10:16:26.291] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [10:16:26.311] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [10:16:26.330] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [10:16:26.349] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [10:16:26.373] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [10:16:26.394] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [10:16:26.414] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [10:16:26.434] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [10:16:26.460] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [10:16:26.481] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [10:16:26.503] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [10:16:26.541] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [10:16:26.581] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [10:16:26.620] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [10:16:26.665] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [10:16:26.703] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [10:16:26.741] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [10:16:26.778] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [10:16:26.914] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [10:16:26.991] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [10:16:27.077] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [10:16:27.121] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [10:16:27.146] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [10:16:27.167] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [10:16:27.213] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [10:16:27.282] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [10:16:27.320] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [10:16:27.357] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [10:16:27.395] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [10:16:27.432] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [10:16:27.473] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [10:16:27.583] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [10:16:27.710] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [10:16:27.770] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [10:16:27.846] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [10:16:27.909] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [10:16:27.981] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [10:16:28.040] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [10:16:28.108] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [10:16:28.223] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [10:16:28.286] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted