Eclipse git pull 报Nothing to fetch 异常原因

eclipse git pull 报错
// 使用这个配置会有 org.eclipse.jgit.api.errors.TransportException: Nothing to fetch. 异常
[core]
    repositoryformatversion = 0
    filemode = false
    logallrefupdates = true
[branch "master"]
        remote = origin
        merge = refs/heads/master
[remote "origin"]
        url =
        fetch = +refs/heads/*:refs/remotes/origin/*

//问题解决：
// 使用这个配置就可以正常pull了       
[core]
        symlinks = false//增加了这一样，具体为什么还不知道，对这些参数也不了解， 希望有了解的朋友分享下。
        repositoryformatversion = 0
        filemode = false
        logallrefupdates = true
[branch "master"]
        remote = origin
        merge = refs/heads/master
[remote "origin"]
        url =
        fetch = +refs/heads/*:refs/remotes/origin/*