JSON error with exploit scanner|Wordpress Support|Forum Archive|XCloner

Hi

I installed the Sucuri Scanner plugin as my site was infected with malware.  On running a backup, I'm getting the following error:

Details: parsererror -- Invalid JSON: TAR error: Unable to open file 'wp-content/plugins/exploit-scanner/exploit-scanner.php_sucuribackup.1335219447' in binary read mode
{"backupSize":"21229568","percent":"28","option":"com_cloner","task":"refresh","json":"1","startf":900,"lines":"3153","backup":"backup_2012-04-24_15-33_www.andrewanderi.com-sql-nodrop.tar","excl_manual":""}

JSON
url:
index2.php?option=com_cloner&task=refresh&json=1&startf=800&lines=3153&backup=backup_2012-04-24_15-33_www.andrewanderi.com-sql-nodrop.tar&excl_manual=

Retrying the backup resulted in the same error.

Please advise.

Regards,

Andrew