I'm developing on OSX, and one of my Subversion working copies just started returning the following error for all commands, however my other checkouts work fine. I get the same message with both my Brew installed SVN binaries as well as my Cornerstone client, but other working directories are fine.
> svn update
svn: E155036: Please see the 'svn upgrade' command
svn: E155036: Working copy '/working_directory' is an old development version (format 12); to upgrade it, use a format 18 client, then use 'tools/dev/wc-ng/bump-to-19.py', then use the current client
> svn upgrade
svn: E155019: Can't upgrade '/working_directory' as it is not a pre-1.7 working copy directory
svn: E150000: Missing default entry
I don't have the bump-to-19.py script anywhere on my computer (according to find / -type f -name bump-to-19.py), however I think I was able to find it on the Apache repository. That said, I am not familiar with what it does, or how to use it. Ideally I can avoid checking out a new version of this working directory and manually merging in all of my (many) changes.
The only info I was able to find is related to Netbeans and javahl, and I'm using neither.
EDIT: After downloading the bump-to-19.py file and making it executable, I tried it against my working directory to no avail:
> ./bump-to-19.py working_directory/
error: format is 29 not 18: 'working_directory/'
Although I was not able to figure out why my working directory was corrupted, I was able to work around it using rsync - there is an option, C, that will ignore CVS/SVN files and directories when making a backup. I made a backup using this option, checked out the project again, and then copied the backup back over the new working directory. SVN is happy again.
> rsync -arC working_directory working_directory_no_svn
> rm -rf working_directory
> svn co https://svn.example.com/project/trunk working_directory
> rsync -ar working_directory_no_svn working_directory