Having sync problems with 1 activity

Hi all,

On Saturday, I did a 18 mile run and I'm sure I saved it in the end. But when I tried to sync it gave me failed messages numerous times. The other activities have sync without problems since then. I can see the activity in the watch but can't enter to see the details. When I look in the Garmin memory the .fit file says the date but it shows 0 KB. I tried a couple of .fit file fixers and converters without luck.

Is there anything else I can try to get the data from that run and sync?

Just in case anyone can help the .fit file -> .fit file

Thanks in advance.