svn commit failed with svn: E000013

[wuzhouhui]

svn commit failed with following errors:
    zh$ svn ci -m '1.8/zh: translation of chapter 5 in progress'
    svn: E000013: Commit failed (details follow):
    svn: E000013: Can't open file
    '/svn/p/svnbook/source/db/txn-current-lock': Permission denied

The repository's details is:
    zh$ svn info
    Path: .
    Working Copy Root Path: /Users/wzh/Documents/svnbook
    URL: https://svn.code.sf.net/p/svnbook/source/branches/1.8/zh
    Relative URL: ^/branches/1.8/zh
    Repository Root: https://svn.code.sf.net/p/svnbook/source
    Repository UUID: b70f5e92-ccc6-4167-9ab2-d027528d294b
    Revision: 5638
    Node Kind: directory
    Schedule: normal
    Last Changed Author: wuzhouhui
    Last Changed Rev: 5638
    Last Changed Date: 2018-02-13 20:15:26 +0800 (Tue, 13 Feb 2018)

I'm sure both the username and password are correct. So, what going wrong here?

I have been sent this mail before, but I though it was failed, so I resent it.
If you got it before, please ignore.