ggplot: object 'DiscreteRange' not found - r

Question

This is embarrassing. I've been using the ggplot2 package on a regular basis over the past few months, and now suddenly things seem to go seriously wrong.
Apparently, whenever I try to plot a bar graph I obtain the error:
Error in structure(list(call = match.call(), aesthetics = aesthetics, :
object 'DiscreteRange' not found
This is the error that results, e.g., when I try to run a code as simple as the following:
library(ggplot2)
ggplot(diamonds, aes(x=cut)) + geom_bar()
There is no graphics output, the code stops with the above error message.
If I recall correctly this used to work up to a few days ago, so I suspect that there is some error in an (update of) another package that interferes. Of course, I may also be doing a very stupid mistake that I don't see.
I'm using RStudio version 0.99.467; more information concerning the system and the relevant packages is provided below:
> sessionInfo()
R version 3.2.1 (2015-06-18)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 14.04.3 LTS
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggplot2_1.0.1
loaded via a namespace (and not attached):
[1] Rcpp_0.12.0 lattice_0.20-33 zoo_1.7-11 digest_0.6.8 MASS_7.3-43 grid_3.2.1 plyr_1.8.3 gtable_0.1.2
[9] magrittr_1.5 scales_0.2.5.9003 stringi_0.5-5 reshape2_1.4.1 proto_0.3-10 blotter_0.9.1666 tools_3.2.1 stringr_1.0.0
[17] munsell_0.4.2 colorspace_1.2-6 quantstrat_0.9.1669
I tried to restart a fresh R session and even rebooted the computer, to no avail.
Thank you very much for your help!

Answer 1

I'm going to take a guess that the problem is with the scales package, which is at version: 0.2.5.9003. The packages with "four-part" version numbers x.y.z.wwww look like development versions to me. The current CRAN version is 0.2.5:
a1 <- available.packages()
a1[a1[,"Package"]=="scales","Version"] ## 0.2.5
I don't know how you ended up with a development version (devtools::install_github("hadley/scales") would probably do it) but I would install.packages("scales") (or the equivalent through the RStudio GUI) to re-install the CRAN version and see if that resolves the problem.
Alternatively, you could try keeping the development version of scales and moving to the development version of ggplot2 (devtools::install_github("hadley/ggplot2")).
I'm using the development version of ggplot2 (1.0.1.9003) with the development version of scales (0.2.5.9003) and your example works fine.