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  [23:02:01.953] Benchmark with 60 resampling iterations 
INFO  [23:02:02.199] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [23:02:02.280] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [23:02:02.314] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [23:02:02.348] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [23:02:02.382] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [23:02:02.427] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [23:02:02.477] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [23:02:02.510] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [23:02:02.557] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [23:02:02.609] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [23:02:02.656] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [23:02:03.296] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [23:02:03.892] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [23:02:04.506] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [23:02:05.073] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [23:02:05.623] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [23:02:06.199] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [23:02:06.754] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [23:02:07.314] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [23:02:07.902] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [23:02:08.493] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [23:02:08.524] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [23:02:08.556] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [23:02:08.587] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [23:02:08.619] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [23:02:08.650] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [23:02:08.680] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [23:02:08.710] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [23:02:08.744] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [23:02:08.775] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [23:02:08.801] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [23:02:08.858] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [23:02:08.907] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [23:02:08.971] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [23:02:09.008] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [23:02:09.035] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [23:02:09.075] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [23:02:09.117] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [23:02:09.259] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [23:02:09.318] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [23:02:09.359] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [23:02:09.389] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [23:02:09.420] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [23:02:09.451] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [23:02:09.481] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [23:02:09.517] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [23:02:09.548] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [23:02:09.578] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [23:02:09.609] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [23:02:09.639] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [23:02:09.668] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [23:02:09.745] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [23:02:09.833] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [23:02:09.904] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [23:02:09.996] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [23:02:10.084] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [23:02:10.161] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [23:02:10.244] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [23:02:10.308] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [23:02:10.353] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [23:02:10.410] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted