Failed to execute DDL statement

Hi there,
Recently I experienced some DLL error caused by the missing file. I did not delete any files and I ran a DLL fixer and still I have some DLL files missing. Does anyone can help me to fix this error? Why the DLL fixer didn’t work?
Thank you!

SiIkCentraI Message
Failed to execute DDL statement (C:Program FilesBorlandSC Test Manager 2008 R2ConfAppServerDbUpgradeTM_4001.MSSQL.ddl – Line 6): Cannot insert the value NULL into column ChangedAt, table ITDSEGUETM.dbo.TM_Attributes’S column does not allow nulls INSERT fails,
