Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘glmnetr-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: xgb.simple
  > ### Title: Get a simple XGBoost model fit (no tuning)
  > ### Aliases: xgb.simple
  > 
  > ### ** Examples
  > 
  > ## No test: 
  > # Simulate some data for a Cox model 
  > sim.data=glmnetr.simdata(nrows=1000, ncols=100, beta=NULL)
  > Surv.xgb = ifelse( sim.data$event==1, sim.data$yt, -sim.data$yt )
  > data.full <- xgboost::xgb.DMatrix(data = sim.data$xs, label = Surv.xgb)
  > # for this example we use a small number for folds_n and nrounds to shorten run time 
  > xgbfit = xgb.simple( data.full, objective = "survival:cox")
  Error in begin_iteration:end_iteration : argument of length 0
  Calls: xgb.simple -> xgb.train
  Execution halted