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  [01:49:29.675] Benchmark with 60 resampling iterations 
INFO  [01:49:29.882] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [01:49:29.948] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [01:49:29.985] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [01:49:30.023] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [01:49:30.063] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [01:49:30.103] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [01:49:30.139] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [01:49:30.185] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [01:49:30.220] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [01:49:30.258] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [01:49:30.281] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [01:49:30.515] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [01:49:30.784] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [01:49:30.992] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [01:49:31.157] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [01:49:31.345] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [01:49:31.488] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [01:49:31.633] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [01:49:31.783] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [01:49:31.925] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [01:49:32.071] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [01:49:32.094] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [01:49:32.116] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [01:49:32.138] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [01:49:32.161] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [01:49:32.183] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [01:49:32.204] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [01:49:32.225] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [01:49:32.254] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [01:49:32.276] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [01:49:32.298] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [01:49:32.337] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [01:49:32.375] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [01:49:32.412] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [01:49:32.459] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [01:49:32.498] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [01:49:32.538] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [01:49:32.576] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [01:49:32.683] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [01:49:32.721] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [01:49:32.757] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [01:49:32.778] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [01:49:32.800] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [01:49:32.824] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [01:49:32.845] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [01:49:32.875] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [01:49:32.896] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [01:49:32.917] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [01:49:32.954] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [01:49:32.977] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [01:49:32.999] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [01:49:33.065] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [01:49:33.123] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [01:49:33.181] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [01:49:33.244] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [01:49:33.300] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [01:49:33.366] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [01:49:33.474] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [01:49:33.561] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [01:49:33.626] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [01:49:33.688] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted