commit的时候会提示如下ERROR：
Commit failed (details follow):
svn: E195022: File 'xxxx' is locked in another working copy
svn: E170007: No lock on path 'xxxx'
(Status 423 on PUT Request)
svn: E175002: Server sent unexpected return value (423 Locked) in response to PUT request for 'xxxx'
网上基本上大家提出的解决方法是Clean up，但尝试若干次后都不行。
假如commit时跳过此文件，也会报其他文件lock的错误。
最后我是采用这个方法：
If you are Windows guy and using "Tortoise SVN' user.
Select the File. Right Click. Option 'Tortoise SVN' --> get Lock. Use option 'Steal The Lock'.
