Trying to create ggplot2 boxplot of a raster

GRASS GRASS user
,
1

Trying to create ggplot2 boxplot of a raster using the rgrass interface. Just using the R boxplot() function works fine:

boxplot(sac_storages_df,names=c(“LZFPM”,“LZFSM”,“LZTWM”,“UZFWM”,“UZTWM”,“ZPERC”))

names(sac_storages_df)
[1] “sac_LZFPM” “sac_LZFSM” “sac_LZTWM” “sac_UZFWM_teaiii”
[5] “sac_UZTWM” “sac_ZPERC”

, but with ggplot, I keep getting:

ggplot(sac_storages_df,aes(x=names(sac_storages_df))) + geom_boxplot()

Error in geom_boxplot():
! Problem while computing aesthetics.
:information_source: Error occurred in the 1st layer.
Caused by error in check_aesthetics():
! Aesthetics must be either length 1 or the same as the data (807282).
:heavy_multiplication_x: Fix the following mappings: x.

I have tried many differnt things to address the issue. Any ideas? I have to coerce the raster data read in from grass from a sparaster into a dataframe

Thank you