Lagrangian PT

When view 2D plan of grid and data for Langrangian Particle Tracks, it jumped up a message"Bad drift file. Skipping".
Why?
How to solve this problem?
Thank you very much!

binlichen wrote: When view 2D plan of grid and data for Langrangian Particle Tracks, it jumped up a message"Bad drift file. Skipping". Why? How to solve this problem? Thank you very much!
Please use these example settings for your LPT model references. The drifters should located inside of model domain and should have a number of particles there.{REMOVED} Hope this helps. Best regards, // Tinh