Subversion says I should report this. So here is the exception:

---------------------------
Subversion Exception!
---------------------------
Subversion encountered a serious problem.
Please take the time to report this on the Subversion mailing list
with as much information as possible about what
you were trying to do.
But please first search the mailing list archives for the error message
to avoid reporting the same problem repeatedly.
You can find the mailing list archives at
http://subversion.apache.org/mailing-lists.html

Subversion reported the following
(you can copy the content of this dialog
to the clipboard using Ctrl-C):

In file
'D:\Development\SVN\Releases\TortoiseSVN-1.9.1\ext\subversion\subversion\libsvn_client\commit_util.c'
line 1197: assertion failed (svn_dirent_is_absolute(base_dir_abspath))
---------------------------
OK
---------------------------

I had two copies of a repository and didn't notice I was trying to commit two files from one, and one file from the other.

```--

Salu2. . .```