WPDB error:

A very strange thing happened when i would backup the filesystem today. It does not help to reinstall online backup,the problem still remains.
What should i do to fix this problem?
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A database operation failed.
Please try reinstalling the plugin – in most cases this will repair the database.
Please contact support if the issue persists, providing the complete event log for the activity. Diagnostic information follows:

Failed at: 1173(/hsphere/local/home/user99/mydomain.com/wp-content/plugins/wponlinebackup/include/files.php)
WPDB error: An entry for a file was inserted into the database but couldn’t be found afterwards!
Hexdump of the file name is: 5f49636b746ac3a4726e2d322e6a7067
When escaped for insertion: 5f49636b746ac33f726e2d322e6a7067 (_Icktj??rn-2.jpg)
. Last query: SELECT counter, name_bin FROM wp_wponlinebackup_items WHERE bin = 2 AND parent_id = 419 AND type = 1 AND name = ‘_Icktj??rn-2.jpg’
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http://wordpress.org/extend/plugins/wponlinebackup/