启动R3.0.0和RStudio时出现错误消息

Question

I just downloaded R3.0.0 in Windows 7, 64 bit.

When I click on the R icon, R launches but with the following error and warning

Error in loadNamespace(name) : there is no package called ‘modeltools’
During startup - Warning message:
unable to restore saved data in .RData 

and when I try to start RStudio, it does not launch but says

The R session had a fatal error

Answer 1

Below is a screenshot of the current home page for RStudio support:

A simple reinstall should solve your problem. Do be sure to verify the downloaded file's integrity by checking its MD5 hash. I'm not a Windows user so I can't recommend any particular software in particular to do this. I guess a good starting point would be Microsoft's FCIV (read about it here and here ). But, I'm sure there are lots of GUI alternatives too.

At the RStudio download page you'll notice that the correct MD5 hashes are listed, along with the correct file sizes.

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As for your error about the .RData file, that sounds like a corrupt .RData file that should be deleted. Most likely, somewhere along the line, you clicked on "yes" when R asked you if you wanted to save the current session (rather than you explicitly deciding to save the session, and thus, giving the file a proper name). Since the file has a dot before it, you'll probably need to enable "show hidden files and folders" to find it.

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Also, remember that after reinstalling R, you'll have to also reinstall all of your installed packages before you can use them! After you have R and RStudio back up running, try something like:

update.packages(checkBuilt = TRUE)

to reinstall all of the packages you installed from CRAN. If you've installed packages from GitHub and other places, you would need to reinstall those manually.