The problem is that the folder is already under version control.
Here‘s how I fix this type of problem when it comes up:
.settings folder /trunk/cboon/Project1/) .settings directory there and delete it .settings is in conflict, accept the incoming change. .settings back into place and refresh. It should now have a ‘?‘ badge, indicating that it‘s not under control svn:ignore it
from:http://stackoverflow.com/questions/16646942/unable-to-add-file-or-folder-to-svnignore
原文:http://www.cnblogs.com/zbw911/p/3951668.html