Introduction

Error: package or namespace load failed for ‘devtools’ in .onAttach(Rcpp::sourceCpp(code, env, rebuild)) : there is no package called ‘devtools.’
In addition: The warning message:
In a library(package, lib. loc = lib. loc, character.only = TRUE, logical.return = TRUE, :
there is no package called ‘devtools.’

This is an error that occurs when trying to load the devtools package in R. This can happen for several reasons, including:

-The devtools package is not installed.
-There is a problem with the version of R used (e.g., an older version).
-There is a problem with the installation of R (e.g., a corrupt file).

What is loadnamespacename?

The loadnamespacename function is used to load the namespace of a package in R. This can be useful when you want to use a package’s functions without actually loading the package into your current R session.

What causes the error?

The “error in loadnamespacename there is no package called devtools” is caused by a conflict between the devtools and rownames packages. Both these packages try to override the default behavior of loadnamespace(). To fix the problem, you can either uninstall one of the packages, or use the namespace package to explicitly specify which package’s loadnamespace() function should be used.

How to fix the error?

If you are facing the error “there is no package called devtools”, it means that the devtools package is not installed in your R environment. You can install the devtools package using the following command:

install.packages(“devtools”)

Conclusion

There is a big problem with the way that R loads packages. The current implementation tries to load all packages when it starts up, even if they’re not used in the script or interactive session. This can cause big delays, especially if you have a lot of packages installed.

The devtools package provides a way to load only the packages that you need, when you need them. It’s called lazy-loading, and it’s a huge improvement.