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  [22:46:45.945] Benchmark with 60 resampling iterations 
INFO  [22:46:46.196] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:46:46.320] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:46:46.369] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:46:46.417] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:46:46.466] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:46:46.514] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:46:46.562] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:46:46.608] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:46:46.641] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:46:46.680] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:46:46.713] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:46:47.348] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:46:47.913] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:46:48.499] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:46:49.027] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:46:49.403] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:46:49.993] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:46:50.529] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:46:51.039] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:46:51.589] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:46:52.153] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:46:52.168] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:46:52.190] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:46:52.207] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:46:52.222] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:46:52.238] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:46:52.254] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:46:52.269] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:46:52.310] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:46:52.341] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:46:52.360] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:46:52.390] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:46:52.416] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:46:52.445] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:46:52.481] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:46:52.507] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:46:52.578] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:46:52.628] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:46:52.701] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:46:52.729] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:46:52.756] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:46:52.771] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:46:52.786] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:46:52.802] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:46:52.818] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:46:52.838] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:46:52.853] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:46:52.884] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:46:52.920] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:46:52.951] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:46:52.982] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:46:53.071] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:46:53.144] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:46:53.184] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:46:53.273] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:46:53.361] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:46:53.455] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:46:53.526] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:46:53.614] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:46:53.703] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:46:53.784] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted