SVN: Cannot commit 'x' and 'y' as they refer to the same URL?

I'm trying to do a commit on my project and am running into the following error. Pay close attention to the path:

Commit failed (details follow):
Cannot commit both
'C:\Development\Project\branches\nextver\project\bin\com\companyname\blah\Foo.java'
and
'C:\Development\Project\branches\nextver\project\src\com\companyname\blah\Foo.java'
as they refer to the same URL

How in the world did this happen? I never had my source files in the bin path in Eclipse! What can I do to fix it? Please tell me there's something better than checking it out again and replacing all of the files. I have 191 Java files alone, not to mention resources and Eclipse files.