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  [22:59:14.993] Benchmark with 60 resampling iterations 
INFO  [22:59:15.114] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [22:59:15.176] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [22:59:15.210] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [22:59:15.259] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [22:59:15.292] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [22:59:15.326] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [22:59:15.386] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [22:59:15.432] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [22:59:15.466] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [22:59:15.502] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [22:59:15.532] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [22:59:15.976] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [22:59:16.550] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [22:59:17.019] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [22:59:17.549] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [22:59:18.096] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [22:59:18.590] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [22:59:19.113] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [22:59:19.617] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [22:59:20.085] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [22:59:20.687] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [22:59:20.721] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [22:59:20.753] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [22:59:20.786] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [22:59:20.818] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [22:59:20.851] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [22:59:20.884] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [22:59:20.912] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [22:59:20.967] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [22:59:20.998] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [22:59:21.013] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [22:59:21.077] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [22:59:21.120] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [22:59:21.168] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [22:59:21.193] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [22:59:21.219] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [22:59:21.244] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [22:59:21.271] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [22:59:21.386] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [22:59:21.445] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [22:59:21.482] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [22:59:21.497] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [22:59:21.511] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [22:59:21.527] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [22:59:21.541] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [22:59:21.561] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [22:59:21.576] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [22:59:21.591] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [22:59:21.607] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [22:59:21.621] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [22:59:21.635] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [22:59:21.679] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [22:59:21.720] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [22:59:21.761] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [22:59:21.839] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [22:59:21.900] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [22:59:21.945] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [22:59:22.022] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [22:59:22.116] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [22:59:22.180] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [22:59:22.224] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted