I am getting the below error and don't know what is causing it.
I am following this vignette to learn MODISTools.
https://cran.r-project.org/web/packages/MODISTools/vignettes/modistools-vignette.html
library(MODISTools)
products <- mt_products()
Warning: namespace ‘cachem’ is not available and has been replaced
by .GlobalEnv when processing object ‘<unknown>’
Error in validate_key(key) : could not find function "validate_key"