ggplot_na_imputations
instead.plotNA.imputations was replaced by ggplot_na_imputations
.
The new plotting function provides an improved version of the old plot e.g. it looks better now and is better adjustable,
because it is based on ggplot2. If you absolutely want to use the old function,
you need to download an older package version. Versions 3.0 and below still have the old functions.
plotNA.imputations(x, ...)