svn commit failed with svn: E000013

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?
Received on 2018-02-15 08:53:57 CET