I've had S3Sync running successfully for several months, I just looked at the S3Sync cron job emails I I've found for the last fie days it's been failing with:

/home/xxx/s3sync/s3cmd.rb:144:in `s3cmdMain': undefined method `match' for nil:NilClass (NoMethodError)
       from /home/xxx/s3sync/s3cmd.rb:245

Any ideas?

It's hosted on Hostgator if that makes any difference...