.trashes folder on external hard drive not showing up for sync issue , even in hidden mode!

I am trying to do my usual SNYC FOLDERS PRO sync, which I haven't done since last August, as I keep the external drive at another location for safety.

Usually I just click the tasks to sync and off it goes, but this time it just doesn't want to - it comes up with :

opendir "/Volumes/ External Drive/.Trashes" failed

So I showed hidden files and .Trashes isn't there as hidden file even.

When I try and create new folder ".Trashes" it says it is already created and need to rename new folder!

So it is there, but isn't and I think that SNyc folders pro is failing because it has this problem seeing it too.... But I have checked all permissions and turned off VPN/ firewall and still same problem!

Anyone have any ideas?

Do I need to make that file seen for Sync Pro, or is there something I can do in sync pro, so I don't need to worry about the .Trashes file anymore?

Any help would be much appreciated!

Thanks for reading.

Andy.