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  [01:51:32.508] Benchmark with 60 resampling iterations 
INFO  [01:51:32.693] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [01:51:32.760] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [01:51:32.800] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [01:51:32.873] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [01:51:32.927] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [01:51:32.964] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [01:51:33.020] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [01:51:33.058] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [01:51:33.113] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [01:51:33.172] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [01:51:33.223] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [01:51:33.426] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [01:51:33.648] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [01:51:33.833] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [01:51:33.979] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [01:51:34.135] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [01:51:34.306] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [01:51:34.460] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [01:51:34.606] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [01:51:34.743] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [01:51:34.935] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [01:51:34.956] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [01:51:34.976] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [01:51:34.996] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [01:51:35.016] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [01:51:35.034] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [01:51:35.055] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [01:51:35.074] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [01:51:35.101] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [01:51:35.122] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [01:51:35.142] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [01:51:35.178] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [01:51:35.215] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [01:51:35.251] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [01:51:35.294] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [01:51:35.331] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [01:51:35.367] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [01:51:35.403] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [01:51:35.487] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [01:51:35.522] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [01:51:35.558] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [01:51:35.578] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [01:51:35.599] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [01:51:35.628] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [01:51:35.650] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [01:51:35.686] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [01:51:35.707] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [01:51:35.729] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [01:51:35.750] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [01:51:35.771] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [01:51:35.794] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [01:51:35.859] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [01:51:35.915] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [01:51:35.973] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [01:51:36.037] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [01:51:36.094] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [01:51:36.157] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [01:51:36.213] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [01:51:36.270] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [01:51:36.334] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [01:51:36.392] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted