TortoiseSVN - “is locked in another working copy” error

On Windows, I fixed the problem by the following steps:
1. Launch Repository Browser by clicking "Repo-browser" in the menu.
2. Locate the locked file.
3. Right click your mouse on the locked file.
4. Click "break lock".

https://stackoverflow.com/questions/21862134/svn-frequently-says-file-is-locked-by-me-in-another-working-copy