Failed to acquire the project lock

Problem

You are trying to open or delete a project in a Creative Finishing application and you get the following error messages:
Project is currently in use. Please see shell for details.

The console contains error messages similar to the following:
Failed to acquire the project lock. Identifying the current active users.
Project is currently locked by: ???:750 on macprosmokes mac-pro

Solution

When a project is open, Smoke creates a lock file to prevent other users from opening the same project at the same time. Lock files are automatically deleted when you exit the software.
If the software crashes while a project is open, the lock files are not deleted, so the project will incorrectly appear as being in use next time you try to access it.

If you are sure that no other workstation in your facility is remotely working on the project, perform the following tasks to find and remove the lock files:

1. Exit Smoke and make sure no other workstation on your network is accessing projects on this system.
    
2. Open the Service Monitor app from the Applications/Autodesk/Smoke Common Utilities folder and stop the Stone+Wire service.
    
3. Open the Terminal app from Applications/Utilities and type the following commands to remove the project locks:
   sudo find /usr/discreet/clip | grep ".ref" | xargs -L1 rm -f
   sudo find /usr/discreet/clip | grep "\-lock" | xargs -L1 rm -f
    
4. Enter your password.
    
5. Close Terminal, reopen the Service Monitor and restart the Stone+Wire service.
    
6. Restart Smoke.
   You should now be able to open or delete the project.