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  [09:34:19.654] Benchmark with 60 resampling iterations 
INFO  [09:34:19.859] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [09:34:19.927] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [09:34:19.960] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [09:34:19.993] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [09:34:20.023] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [09:34:20.054] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [09:34:20.084] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [09:34:20.116] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [09:34:20.153] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [09:34:20.184] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [09:34:20.214] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [09:34:20.789] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [09:34:21.213] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [09:34:21.365] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [09:34:21.629] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [09:34:22.220] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [09:34:22.716] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [09:34:22.876] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [09:34:23.480] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [09:34:24.050] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [09:34:24.617] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [09:34:24.651] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [09:34:24.669] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [09:34:24.703] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [09:34:24.720] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [09:34:24.738] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [09:34:24.761] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [09:34:24.779] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [09:34:24.797] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [09:34:24.821] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [09:34:24.841] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [09:34:24.876] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [09:34:24.915] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [09:34:24.993] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [09:34:25.062] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [09:34:25.119] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [09:34:25.160] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [09:34:25.204] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [09:34:25.236] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [09:34:25.270] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [09:34:25.305] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [09:34:25.327] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [09:34:25.354] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [09:34:25.376] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [09:34:25.397] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [09:34:25.418] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [09:34:25.438] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [09:34:25.457] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [09:34:25.478] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [09:34:25.499] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [09:34:25.523] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [09:34:25.578] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [09:34:25.633] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [09:34:25.693] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [09:34:25.748] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [09:34:25.807] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [09:34:25.854] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [09:34:25.899] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [09:34:25.950] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [09:34:26.000] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [09:34:26.053] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted