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  [22:48:44.540] Benchmark with 60 resampling iterations 
INFO  [22:48:44.751] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:48:44.856] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:48:44.916] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:48:44.961] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:48:45.008] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:48:45.057] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:48:45.104] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:48:45.138] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:48:45.171] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:48:45.209] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:48:45.242] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:48:45.744] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:48:46.211] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:48:46.757] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:48:47.324] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:48:47.800] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:48:48.311] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:48:48.804] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:48:49.279] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:48:49.878] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:48:50.567] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:48:50.599] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:48:50.633] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:48:50.660] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:48:50.692] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:48:50.723] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:48:50.754] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:48:50.786] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:48:50.822] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:48:50.850] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:48:50.882] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:48:50.938] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:48:50.988] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:48:51.046] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:48:51.109] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:48:51.168] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:48:51.211] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:48:51.270] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:48:51.393] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:48:51.450] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:48:51.492] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:48:51.522] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:48:51.555] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:48:51.572] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:48:51.615] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:48:51.650] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:48:51.681] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:48:51.711] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:48:51.741] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:48:51.764] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:48:51.778] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:48:51.822] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:48:51.865] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:48:51.915] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:48:51.985] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:48:52.043] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:48:52.090] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:48:52.144] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:48:52.218] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:48:52.324] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:48:52.397] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted