svn: E155036 Working copy ... is too old Please see the 'svn upgrade' command

$ svn info
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

$ svn upgrade
Upgraded '.'
Upgraded 'scripts'
Upgraded 'merge-info'
Upgraded 'merge-log'
......

执行完毕后，刷新一下项目的repository