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  [22:48:38.608] Benchmark with 60 resampling iterations 
INFO  [22:48:38.733] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:48:38.795] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:48:38.829] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:48:38.862] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:48:38.895] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:48:38.928] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:48:38.961] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:48:38.994] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:48:39.027] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:48:39.080] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:48:39.114] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:48:39.629] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:48:40.221] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:48:40.832] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:48:41.431] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:48:41.950] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:48:42.437] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:48:43.019] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:48:43.569] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:48:44.186] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:48:44.690] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:48:44.706] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:48:44.738] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:48:44.770] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:48:44.785] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:48:44.817] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:48:44.833] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:48:44.849] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:48:44.868] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:48:44.881] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:48:44.895] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:48:44.940] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:48:44.998] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:48:45.025] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:48:45.058] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:48:45.084] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:48:45.110] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:48:45.136] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:48:45.199] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:48:45.240] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:48:45.306] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:48:45.321] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:48:45.352] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:48:45.383] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:48:45.414] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:48:45.467] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:48:45.486] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:48:45.501] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:48:45.516] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:48:45.531] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:48:45.546] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:48:45.668] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:48:45.764] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:48:45.832] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:48:45.926] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:48:45.976] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:48:46.038] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:48:46.147] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:48:46.186] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:48:46.232] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:48:46.273] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted