Please see the 'svn upgrade' command

svn: E155036: Please see the 'svn upgrade' command
svn: E155036: Working copy '/home/easwy/dev' is too old (format 10, created by Subversion 1.6)

出现该问题是由于工程目录的svn版本比本机安装的svn版本低导致的，解决办法：在命令行下跳转到工程目录文件夹，执行"svn upgrade"命令即可

$ svn upgrade