I am trying to add a external class folder to my existing project. When I try to do that I get this error .classpath is read only . I tried looking around for solutions and in most places I found that may be the eclipse_classpath.xml is read only. I was syncing this original project from a version control system and then trying to add another folder from the version control system as well. I first checked out the classpath file and change the file permission from read only to writable. Then when I imported this in eclipse and try to add an external folder by going under configure build path I get the error saying .classpath is read only. After that I went in eclipse to check the permission on the file. I see that read only flag was disable which looks fine to me. I do see 2 other options there one is Archive and other one is Derived that are unchecked as well. I am not sure what am I doing wrong here? Can someone please advice.