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  [17:24:05.282] Benchmark with 60 resampling iterations 
INFO  [17:24:05.442] Applying learner 'classif.featureless' on task 'spam' (iter 1/10) 
INFO  [17:24:05.489] Applying learner 'classif.featureless' on task 'spam' (iter 2/10) 
INFO  [17:24:05.508] Applying learner 'classif.featureless' on task 'spam' (iter 3/10) 
INFO  [17:24:05.533] Applying learner 'classif.featureless' on task 'spam' (iter 4/10) 
INFO  [17:24:05.582] Applying learner 'classif.featureless' on task 'spam' (iter 5/10) 
INFO  [17:24:05.619] Applying learner 'classif.featureless' on task 'spam' (iter 6/10) 
INFO  [17:24:05.655] Applying learner 'classif.featureless' on task 'spam' (iter 7/10) 
INFO  [17:24:05.709] Applying learner 'classif.featureless' on task 'spam' (iter 8/10) 
INFO  [17:24:05.746] Applying learner 'classif.featureless' on task 'spam' (iter 9/10) 
INFO  [17:24:05.791] Applying learner 'classif.featureless' on task 'spam' (iter 10/10) 
INFO  [17:24:05.834] Applying learner 'classif.rpart' on task 'spam' (iter 1/10) 
INFO  [17:24:06.277] Applying learner 'classif.rpart' on task 'spam' (iter 2/10) 
INFO  [17:24:06.825] Applying learner 'classif.rpart' on task 'spam' (iter 3/10) 
INFO  [17:24:07.302] Applying learner 'classif.rpart' on task 'spam' (iter 4/10) 
INFO  [17:24:07.447] Applying learner 'classif.rpart' on task 'spam' (iter 5/10) 
INFO  [17:24:07.940] Applying learner 'classif.rpart' on task 'spam' (iter 6/10) 
INFO  [17:24:08.455] Applying learner 'classif.rpart' on task 'spam' (iter 7/10) 
INFO  [17:24:08.706] Applying learner 'classif.rpart' on task 'spam' (iter 8/10) 
INFO  [17:24:08.848] Applying learner 'classif.rpart' on task 'spam' (iter 9/10) 
INFO  [17:24:09.262] Applying learner 'classif.rpart' on task 'spam' (iter 10/10) 
INFO  [17:24:09.858] Applying learner 'classif.featureless' on task 'pima' (iter 1/10) 
INFO  [17:24:09.877] Applying learner 'classif.featureless' on task 'pima' (iter 2/10) 
INFO  [17:24:09.896] Applying learner 'classif.featureless' on task 'pima' (iter 3/10) 
INFO  [17:24:09.915] Applying learner 'classif.featureless' on task 'pima' (iter 4/10) 
INFO  [17:24:09.934] Applying learner 'classif.featureless' on task 'pima' (iter 5/10) 
INFO  [17:24:09.959] Applying learner 'classif.featureless' on task 'pima' (iter 6/10) 
INFO  [17:24:09.976] Applying learner 'classif.featureless' on task 'pima' (iter 7/10) 
INFO  [17:24:09.995] Applying learner 'classif.featureless' on task 'pima' (iter 8/10) 
INFO  [17:24:10.014] Applying learner 'classif.featureless' on task 'pima' (iter 9/10) 
INFO  [17:24:10.033] Applying learner 'classif.featureless' on task 'pima' (iter 10/10) 
INFO  [17:24:10.051] Applying learner 'classif.rpart' on task 'pima' (iter 1/10) 
INFO  [17:24:10.096] Applying learner 'classif.rpart' on task 'pima' (iter 2/10) 
INFO  [17:24:10.147] Applying learner 'classif.rpart' on task 'pima' (iter 3/10) 
INFO  [17:24:10.185] Applying learner 'classif.rpart' on task 'pima' (iter 4/10) 
INFO  [17:24:10.221] Applying learner 'classif.rpart' on task 'pima' (iter 5/10) 
INFO  [17:24:10.257] Applying learner 'classif.rpart' on task 'pima' (iter 6/10) 
INFO  [17:24:10.333] Applying learner 'classif.rpart' on task 'pima' (iter 7/10) 
INFO  [17:24:10.368] Applying learner 'classif.rpart' on task 'pima' (iter 8/10) 
INFO  [17:24:10.402] Applying learner 'classif.rpart' on task 'pima' (iter 9/10) 
INFO  [17:24:10.435] Applying learner 'classif.rpart' on task 'pima' (iter 10/10) 
INFO  [17:24:10.468] Applying learner 'classif.featureless' on task 'sonar' (iter 1/10) 
INFO  [17:24:10.487] Applying learner 'classif.featureless' on task 'sonar' (iter 2/10) 
INFO  [17:24:10.511] Applying learner 'classif.featureless' on task 'sonar' (iter 3/10) 
INFO  [17:24:10.529] Applying learner 'classif.featureless' on task 'sonar' (iter 4/10) 
INFO  [17:24:10.548] Applying learner 'classif.featureless' on task 'sonar' (iter 5/10) 
INFO  [17:24:10.566] Applying learner 'classif.featureless' on task 'sonar' (iter 6/10) 
INFO  [17:24:10.585] Applying learner 'classif.featureless' on task 'sonar' (iter 7/10) 
INFO  [17:24:10.605] Applying learner 'classif.featureless' on task 'sonar' (iter 8/10) 
INFO  [17:24:10.624] Applying learner 'classif.featureless' on task 'sonar' (iter 9/10) 
INFO  [17:24:10.643] Applying learner 'classif.featureless' on task 'sonar' (iter 10/10) 
INFO  [17:24:10.668] Applying learner 'classif.rpart' on task 'sonar' (iter 1/10) 
INFO  [17:24:10.724] Applying learner 'classif.rpart' on task 'sonar' (iter 2/10) 
INFO  [17:24:10.781] Applying learner 'classif.rpart' on task 'sonar' (iter 3/10) 
INFO  [17:24:10.846] Applying learner 'classif.rpart' on task 'sonar' (iter 4/10) 
INFO  [17:24:10.902] Applying learner 'classif.rpart' on task 'sonar' (iter 5/10) 
INFO  [17:24:10.964] Applying learner 'classif.rpart' on task 'sonar' (iter 6/10) 
INFO  [17:24:11.018] Applying learner 'classif.rpart' on task 'sonar' (iter 7/10) 
INFO  [17:24:11.073] Applying learner 'classif.rpart' on task 'sonar' (iter 8/10) 
INFO  [17:24:11.134] Applying learner 'classif.rpart' on task 'sonar' (iter 9/10) 
INFO  [17:24:11.188] Applying learner 'classif.rpart' on task 'sonar' (iter 10/10) 
INFO  [17:24:11.249] Finished benchmark 
> 
> head(fortify(object))
Error: $ operator is invalid for atomic vectors
Execution halted