Running examples in ‘eyetrackingR-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: analyze_time_clusters
> ### Title: Bootstrap analysis of time-clusters.
> ### Aliases: analyze_time_clusters analyze_time_clusters.time_cluster_data
> 
> ### ** Examples
> 
> data(word_recognition)
> data <- make_eyetrackingr_data(word_recognition, 
+                                participant_column = "ParticipantName",
+                                trial_column = "Trial",
+                                time_column = "TimeFromTrialOnset",
+                                trackloss_column = "TrackLoss",
+                                aoi_columns = c('Animate','Inanimate'),
+                                treat_non_aoi_looks_as_missing = TRUE )
> response_window <- subset_by_window(data, window_start_time = 15500, window_end_time = 21000, 
+                                     rezero = FALSE)
Avg. window length in new data will be 5500
> response_time <- make_time_sequence_data(response_window, time_bin_size = 500, aois = "Animate", 
+                                          predictor_columns = "Sex")
> 
> time_cluster_data <- make_time_cluster_data(data = response_time, predictor_column = "SexM", 
+                          aoi = "Animate", test = "lmer", 
+                          threshold = 1.5, 
+                          formula = LogitAdjusted ~ Sex + (1|Trial) + (1|ParticipantName))
boundary (singular) fit: see ?isSingular
> summary(time_cluster_data)
Test Type:	 lmer 
Predictor:	 SexM 
Formula:	 LogitAdjusted ~ Sex + (1 | Trial) + (1 | ParticipantName) 
Summary of Clusters ======
  Cluster Direction SumStatistic StartTime EndTime
1       1  Positive     1.577544     16000   16500
> plot(time_cluster_data)
Error in grid.Call.graphics(C_setviewport, vp, TRUE) : 
  VECTOR_ELT() can only be applied to a 'list', not a 'double'
Calls: <Anonymous> ... lapply -> FUN -> push.vp.viewport -> grid.Call.graphics
Execution halted