Encountered an error and do not know how to solve it：CFL violation mod_sound.F90

[PhD-lihq]

-------------- FATAL CALLED ---------------
Fatal in file: mod_sound.F90 at line: 652
CFL violation

mod_sound.F90 : 652: 1
Abort called by computing node 0 at 2022-05-08 15:56:31.119
+0800 Execution terminated because of runtime error
application called MPI_Abort(comm=0x84000000, 1) - process 0

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I always get this error when running a nested 3km experiment, I don't know how to solve it, I hope you can answer it for me, thank you！