I have a client who had to rebuild his automated build server. He checked out his project folder from my subversion server but is now no longer able to commit - he gets this err
Error message was least informative. Seems to be caused by various reasons.
For me, it turned out, I had no write access to the current directory on local machine, where Subversion attempted to create a temporary file for commit message, as I tried to make a new directory directly in the repository.
Changing current working directory to my Documents folder solved the problem in an instant.