“试图用SVNANT锁定一个已锁定的dir”。

I'm using SVNANT for checking out my project directory on my Windows XP machine. The first time I've used tortoiseSVN for the check out.. as result I obtained an error message relative to the incompatible versions so I had to fix it using a downgrade script. Now,I can't use tortoiseSVN for any operation on my project folder because of this uncompatibility issue. The problem is that everytime I try to check out the project with SVNANT I receive this message:I'm using SVNANT for checking out my project di