TortoiseSVN error: Working copy path does not exist in repository

I've got a file that I tried to commit using TortoiseSVN, but it gave me the error that the working copy path does not exist, and I have to update my working copy first. So I tried a variety of things:

• Reverting the file to a previous version
• Deleting the file, trying to commit without it, then trying to re-add it
• Deleting the entire folder in my working directory and and re-updating it
• Doing a clean-up
• Resolving any conflicts
• Using the Repo browser to manually add the file to the repository, then trying to re-update, then re-deleting it through the Repo browser

And after all this, I still get the same error. I can't even do a fresh check-out because of the error:

"Working copy path 'path/to/file' does not exist in repository."

I'm completely out of ideas at this point. Help!

Add the directory to your SVN repository using TortoiseSVN. Then try to add the file.