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  [02:07:08.381] Benchmark with 60 resampling iterations 
INFO  [02:07:08.577] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [02:07:08.647] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [02:07:08.739] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [02:07:08.783] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [02:07:08.811] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [02:07:08.839] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [02:07:08.860] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [02:07:08.904] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [02:07:08.927] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [02:07:08.971] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [02:07:08.991] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [02:07:09.181] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [02:07:09.397] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [02:07:09.604] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [02:07:09.834] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [02:07:10.103] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [02:07:10.393] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [02:07:10.553] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [02:07:10.784] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [02:07:10.981] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [02:07:11.141] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [02:07:11.166] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [02:07:11.187] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [02:07:11.209] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [02:07:11.232] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [02:07:11.253] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [02:07:11.277] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [02:07:11.299] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [02:07:11.329] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [02:07:11.352] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [02:07:11.374] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [02:07:11.415] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [02:07:11.455] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [02:07:11.496] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [02:07:11.544] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [02:07:11.587] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [02:07:11.677] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [02:07:11.726] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [02:07:11.830] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [02:07:11.887] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [02:07:11.965] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [02:07:11.994] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [02:07:12.051] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [02:07:12.073] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [02:07:12.128] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [02:07:12.196] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [02:07:12.220] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [02:07:12.244] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [02:07:12.278] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [02:07:12.307] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [02:07:12.333] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [02:07:12.419] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [02:07:12.480] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [02:07:12.540] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [02:07:12.604] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [02:07:12.661] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [02:07:12.726] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [02:07:12.782] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [02:07:12.840] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [02:07:12.906] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [02:07:12.967] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted