Error sharing horizon files in Landmark
"DG2W: Error from DG2RWH: 3"

If you are working in a horizon, then another team member edits it, it's possible that you will have 
a problem with the NFS (Network File System). You'll get an error message in Landmark that says 
"DG2W: Error from DG2RWH: 3". To solve this problem you can delete the garbage file created 
when Landmark tries to access the horizon.

The garbage file will be located in the seismic project directory and will be owned by the 2nd user. 
The 2nd user should go to the /medusa/s3/lgcproject/pa/<seismic project directory> 
For example: cd /medusa/s3/lgcproject/pa/aug_anis

List everything in the directory (ls -al). 
You should see at least one file that starts with .nfs00000#### 
(note the "." in front of the file name).
Delete that file that is owned by you (rm .nfs00000####)

Your problem should then be solved. I would log out and log back in to Landmark 
just to make sure you don't have any residual problems.

Note: You may also need to Rebuild the Horizon Index File.
1. Everyone should log out of the project
2. Seismic Project Manager -> Horizon -> HorizUtil
3. Select the project and click on the "Rebuild Horizon Index" button