scale_fill_distiller ggplot图例在某些数据帧中丢失，但在其他数据帧中没有

I'm new to R so I haven't figured out how to apply the same changes to multiple data frames and plot from each resultant data frame. I've done this by plugging in each input csv one by one in an R markdown file. I'm new to R so I haven't figured out how to ap