My app using libsvn-client can't update because of "woking directory xxx is locked." error

I am developing some kind of version management application using svn library. For test, I made small application that get the list of the repository. It works fine. I could get the list of files. Next, I try to make a app checkout or update. It use libsvn_client_checkout/update. Unfortunately, i met "working directory xxx is locked" error message. I tried several solutions that I found.

1. I chedked that .svn folder have lock file. but, there are no lock file.
2. I turn off the anti-virus and index service of windows. but, it didn't works, too.
3. I tried svn cleanup commend. It is not helpful to my problem.

I use MS Visual Studio 2008 and svn-win32-1.6.13 library on Windows 7 pro. I also got the开发者_如何学JAVA same error message from testing on Windows XP SP3.

What's the problem of "working directory xx locked."???????

Since you indicated you are using Windows, have tried shutting down and restarting the computer yet? Windows is notorious for locking stuff and never letting go until after a restart. All it takes is one DLL, maybe even the one you're using in your program, to lock onto a file and then no other application can get a hold of it.