Coudn't find ggpairs and grid.arrange

[njdcornites]

Hi,

I am building a slidify deck now but I got error saying "Error in function_list[k] : object 'GGally' not found" after I run this. vn[,1:5] %>% as.data.frame() %>% ggpairs()

here's the sessioninfo:

R version 3.4.3 (2017-11-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_Philippines.1252 LC_CTYPE=English_Philippines.1252
[3] LC_MONETARY=English_Philippines.1252 LC_NUMERIC=C
[5] LC_TIME=English_Philippines.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] GGally_1.3.2 gridExtra_2.3 DT_0.4 fpp2_2.1 ggplot2_2.2.1 expsmooth_2.3
[7] fma_2.3 forecast_8.2 slidify_0.5

loaded via a namespace (and not attached):
[1] progress_1.1.2 zoo_1.8-1 reshape2_1.4.3 lattice_0.20-35
[5] colorspace_1.3-2 htmltools_0.3.6 yaml_2.1.16 rlang_0.1.6
[9] pillar_1.1.0 RColorBrewer_1.1-2 TTR_0.23-3 plyr_1.8.4
[13] quantmod_0.4-12 stringr_1.2.0 timeDate_3042.101 munsell_0.4.3
[17] gtable_0.2.0 htmlwidgets_1.0 evaluate_0.10.1 labeling_0.3
[21] knitr_1.19 tseries_0.10-42 httpuv_1.3.5 lmtest_0.9-35
[25] crosstalk_1.0.0 parallel_3.4.3 curl_3.1 markdown_0.8
[29] xts_0.10-1 Rcpp_0.12.14 xtable_1.8-2 scales_0.5.0
[33] backports_1.1.2 jsonlite_1.5 mime_0.5 fracdiff_1.4-2
[37] digest_0.6.14 stringi_1.1.6 shiny_1.0.5 grid_3.4.3
[41] rprojroot_1.3-2 quadprog_1.5-5 tools_3.4.3 magrittr_1.5
[45] lazyeval_0.2.1 tibble_1.4.1 whisker_0.3-2 prettyunits_1.0.2
[49] rsconnect_0.8.5 assertthat_0.2.0 reshape_0.8.7 rmarkdown_1.8
[53] R6_2.2.2 nnet_7.3-12 compiler_3.4.3