warning: theme element not in hierarchy

[EllistonV]

Hello,

I am having trouble with nesting in the x-axis. The error message is as follows:

Warning message:
In plot_theme(plot) :
  The `ggh4x.axis.nestline.x` theme element is not defined in the element hierarchy.

The code I am running looks something like this:

df%>%
   ggplot(., aes(x = paste0(var1,'&',var2), y = var3, fill = var4, width = 0.7))+
   geom_bar(position = 'fill', stat = 'identity')+
  guides(x = ggh4x::guide_axis_nested(delim = "&", angle = 70))+
   scale_fill_manual(values = as.vector(my_color_pallette),
                    name='Var4')+
  labs(x = NULL, tag = 'B)',
       y = 'Var3)+
   facet_grid(~var5, scale = 'free')+
  theme_classic()+
  theme(axis.text = element_text(size = 11),
        legend.title = element_text(size = 11), 
        legend.text = element_text(size = 11),
        legend.key.size = unit(1, 'cm'), 
        legend.key.height = unit(0.35, 'cm'), 
        legend.key.width = unit(0.35, 'cm'), 
        text = element_text(family = 'Times New Roman', size = 13),
        ggh4x.axis.nestline.x=element_line(size = 1, colour = 'black'))

I have ggplot version 3.5.2 and ggh4x version 0.3.1.

How can I fix this problem? In advance, thank you.

[yhj-j]

I encountered the same issue. How did you resolve it in the end?