Certain library(packages) not working -- error

library(plm)
Error: package or namespace load failed for ‘plm’ in runHook(".onLoad", env, package.lib, package):
cannot open file

library(mlogit)
Loading required package: dfidx
Error: package or namespace load failed for ‘dfidx’ in get(Info[i, 1], envir = env):
cannot open file : No such file or directory
Error: package ‘dfidx’ could not be loaded

library(gplots)
Error: package or namespace load failed for ‘gplots’ in library.dynam(lib, package, package.lib):
DLL ‘gtools’ not found: maybe not installed for this architecture?

library(erer)
Loading required package: lmtest
Loading required package: zoo
Error: package or namespace load failed for ‘zoo’ in get(Info[i, 1], envir = env):
cannot open file: : No such file or directory
Error: package ‘zoo’ could not be loaded

library(leaps)
Error: package or namespace load failed for ‘leaps’ in get(Info[i, 1], envir = env):
cannot open file : No such file or directory

in general you wont be able to load library's that you havent yet installed.

install.packages("plm")

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