Wp85xx can not DEBUG (GDB could not start)

My program can debug on the board of wp76, but can’t int wp85. Do I need to configure something?

legato version:18.06.4_a2b118ed13919cebd20f9d71e8810748_modified

LOG:
Jan 6 00:16:21 | supervisor[5154]/supervisor T=main | proc.c proc_Start() 1354 | Execing ‘bin/gdbserver’
Jan 6 00:16:21 | supervisor[5154]/supervisor T=main | proc.c proc_Start() 1366 | Could not exec ‘bin/gdbserver’. Permission denied.
Jan 6 00:16:21 | supervisor[672]/supervisor T=main | proc.c proc_SigChildHandler() 2035 | Process ‘gdbserver@0’ (PID: 5154) has exited with exit code 1.

is it the same issue?