SEPM event ID 7203 when checking in the latest virus defs

Given I run SEPM on a closed network I download the latest virus defs from the FTP site

ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/norton_antivirus/jdb/

The files where all checking in fine up until a few days ago, now in the event logs on the SEPM server we use to put the jdb file we are getting a warning event 7203 at the time of the file check in and the checkin is failing ?

Any ideas as to what the event ID actually means ?

Cheers

Fal