Running examples in 'weibulltools-Ex.R' failed
The error most likely occurred in:

> ### Name: plot_mod
> ### Title: Add Estimated Population Line(s) to a Probability Plot
> ### Aliases: plot_mod plot_mod.wt_model
> 
> ### ** Examples
> 
> # Reliability data:
> data <- reliability_data(data = alloy, x = cycles, status = status)
> 
> # Probability estimation:
> prob_tbl <- estimate_cdf(data, methods = c("johnson", "kaplan"))
> 
> 
> ## Rank Regression
> # Example 1 - Probability Plot and Regression Line Three-Parameter-Weibull:
> plot_weibull <- plot_prob(prob_tbl, distribution = "weibull")
> rr_weibull <- rank_regression(prob_tbl, distribution = "weibull3")
> 
> plot_reg_weibull <- plot_mod(p_obj = plot_weibull, x = rr_weibull)
> 
> # Example 2 - Probability Plot and Regression Line Three-Parameter-Lognormal:
> plot_lognormal <- plot_prob(prob_tbl, distribution = "lognormal")
> rr_lognormal <- rank_regression(prob_tbl, distribution = "lognormal3")
> 
> plot_reg_lognormal <- plot_mod(p_obj = plot_lognormal, x = rr_lognormal)
> 
> 
> ## ML Estimation
> # Example 3 - Probability Plot and Regression Line Two-Parameter-Weibull:
> plot_weibull <- plot_prob(prob_tbl, distribution = "weibull")
> ml_weibull_2 <- ml_estimation(data, distribution = "weibull")
> 
> plot_reg_weibull_2 <- plot_mod(p_obj = plot_weibull, ml_weibull_2)
> 
> 
> ## Mixture Identification
> # Reliability data:
> data_mix <- reliability_data(voltage, x = hours, status = status)
> 
> # Probability estimation:
> prob_mix <- estimate_cdf(
+   data_mix,
+   methods = c("johnson", "kaplan", "nelson")
+ )
> 
> # Example 4 - Probability Plot and Regression Line Mixmod Regression:
> mix_mod_rr <- mixmod_regression(prob_mix, distribution = "weibull")
> plot_weibull <- plot_prob(mix_mod_rr)
> 
> plot_reg_mix_mod_rr <- plot_mod(p_obj = plot_weibull, x = mix_mod_rr)
> 
> # Example 5 - Probability Plot and Regression Line Mixmod EM:
> mix_mod_em <- mixmod_em(data_mix)
Error in mixmod_em_(data = x, distribution = distribution, conf_level = conf_level,  : 
  Parameter estimation was not successful!
Calls: mixmod_em -> mixmod_em.wt_reliability_data -> mixmod_em_
Execution halted