Unable to plot varibles from dataframe in R

  plot_dist = function(df1,df2,features,nrows,ncols){
      fig_list = list()
      j=1
      for (feature in features){
        print(feature)
        fig=ggplot()+
          geom_density(data=df1,aes(feature),color="blue")+
          geom_density(data=df2,aes(feature),color = "black")
        fig_list[j] = list(fig)
        j = j+1  
      }
      multi_plot02 = marrangeGrob(grobs =  fig_list,nrow = nrows,ncol = ncols)
      return(multi_plot02)
    }

where df1,df2 are two dataframes with features from var_0 to var_199 in both dataframes

I have tried noquotes method also, but no luck. If I am running it as single code then it is working but not in loop

Libraries used: ggplot2

  [1]: https://i.stack.imgur.com/gfRDa.png
[getting this, in multiplot][1]  
  [2]: https://i.stack.imgur.com/Ozf2g.png
[expectd this from the code, though it should be in multiplot][2]