error: unpack-objects died of signal 9 with rails app

Hello,

I have a rails app running on a linode, and the code is managed by github. Deploying from local dev to live was going fine up until recently. Now I always get the following error message:

 ** [koop.hk :: out]
 ** [koop.hk :: out] error: unpack-objects died of signal 9
 ** fatal: unpack-objects failed

I researched online, and some say its due to the server disk space being full but mine has enough space. Could it be that the RAM needs upgrading?

Any help would be greatly appreciated!

Mike.