Error in gzfile(file, “wb”): cannot open the connection or compressed file

Question

I\'m trying to run two things: first, I\'m creating a PDF with 4x5, ending with dev.off(), and then trying to create a new graph. However, after starting the second plot, I get:

Answer 1

Haven't seen this case in the other answers: if this seems to happen all the time, and to be very persistent when it does happen, check the default directory in your file handling software connection.
In my case FileZilla was logging on to my DigitalOcean droplet as "root" and whenever I used FileZilla to create a directory it was setting write permissions to "root", whereas my RStudio on the same droplet read/wrote as "My_Name". Anytime I set something up in FZ (e.g. large imported files, renamed or copied) the permissions would switch and I'd get this error.
If this is what is causing frequent error messages it can be solved instantly with chown -R My_Name directoryname but in the longer run, if you are going to be using your file handler to define and create a lot of directories, it will pay to create a connection whose default name is the same name you use for RStudio.