scan disk space failed

Sorry for the delay.

Here is the scan result.

[Jun 17 17:45:25]
Preparing a new scan.
Done.
[Jun 17 17:45:25]
Check if your site is being Spamvertized is for paid members only
Paid Members Only
[Jun 17 17:45:27]
Checking if your IP is generating spam is for paid members only
Paid Members Only
[Jun 17 17:45:29]
Checking if your site is on a domain blacklist is for paid members only
Paid Members Only
[Jun 17 17:45:31]
Checking for the most secure way to get IPs
Secure.
[Jun 17 17:45:32]
Fetching core, theme and plugin file signatures from Wordfence
Success.
[Jun 17 17:45:35]
Fetching list of known malware files from Wordfence
Success.
[Jun 17 17:45:35]
Comparing core WordPress files against originals in repository
Secure.
[Jun 17 17:45:35]
Comparing open source themes against ww.wp.xz.cn originals
Secure.
[Jun 17 17:45:35]
Comparing plugins against ww.wp.xz.cn originals
Secure.
[Jun 17 17:45:35]
Scanning for known malware files
Secure.
[Jun 17 17:45:35]
Scanning for unknown files in wp-admin and wp-includes
Secure.
[Jun 17 17:47:41]
Check for publicly accessible configuration files, backup files and logs
Secure.
[Jun 17 17:47:41]
Scanning file contents for infections and vulnerabilities
Secure.
[Jun 17 17:47:41]
Scanning files for URLs on a domain blacklist
Secure.
[Jun 17 18:01:26]
Scanning for publicly accessible quarantined files
Secure.
[Jun 17 18:01:26]
Scanning posts for URLs on a domain blacklist
Secure.
[Jun 17 18:01:36]
Scanning comments for URLs on a domain blacklist
Secure.
[Jun 17 18:01:43]
Scanning for weak passwords
Secure.
[Jun 17 18:01:51]
Scanning DNS for unauthorized changes
Secure.
[Jun 17 18:01:51]
Scanning to check available disk space
Failed.
[Jun 17 18:01:51]
Scanning for old themes, plugins and core files
Problems found.
[Jun 17 18:01:53]
Scanning for admin users not created through WordPress
Secure.
[Jun 17 18:01:53]
Scan complete. You have 5 new issues to fix. See below.
Scan Complete