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The "plotgrid" function is part of the "cowplot" package in R. To resolve the issue "plotgrid" function could not be found, you need to install the cowplot package by running the following command in your R console:

install.packages("cowplot")

Once the package is installed, you can load it into your R session using the following command:

library(cowplot)

This should then allow you to use the "plot_grid" function without any issues.