File is corrupt

Hello, I need some help.

I  have symantec Backup Exec on windows server 2003.

Recently i have my backup failed with error: FirstStorage\blabla\Logs cannot verify.

File is corrupt.

here is info:

Backup- \\mydomian\Microsoft Information Store\First Storage Group 
V-79-57344-65247 - A failure occurred reading an object.

Backup- \\mydomian\Microsoft Information Store\First Storage Group 
WARNING: "\\mydomain\Microsoft Information Store\First Storage Group\Logs" is a corrupt file. This file cannot verify.

Verify- \\mydomian\Microsoft Information Store\First Storage Group 
WARNING: "Logs" is a corrupt file. This file cannot verify.

PLease help me, what can i do ?