There is a problem sending auracast

I use nRF5340 audio DK,iso_time_sync example, can successfully send BIS data, then I use DK as controller, bumble(google.github.io/.../index.html) as host and it fails to send.

 I don't understand what went wrong. Can you give me some advice?

Here is the entire log

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/mnt/c/Users/Mji/Downloads/bumble/apps$ BUMBLE_LOGLEVEL=DEBUG python auracast.py transmit --input file:audiomono.wav --input-format auto --broadcast-name bumble serial:/dev/ttyACM0,115200
DEBUG:asyncio:Using selector: EpollSelector
DEBUG:bumble.drivers:Probing driver class: rtk
DEBUG:bumble.drivers.rtk:USB metadata not found
DEBUG:bumble.drivers:Probing driver class: intel
DEBUG:bumble.drivers.intel:USB metadata not sufficient
DEBUG:bumble.host:### HOST -> CONTROLLER: HCI_RESET_COMMAND
DEBUG:bumble.host:### CONTROLLER -> HOST: HCI_COMMAND_COMPLETE_EVENT:
num_hci_command_packets: 1
command_opcode: HCI_RESET_COMMAND
return_parameters: HCI_SUCCESS
DEBUG:bumble.host:### HOST -> CONTROLLER: HCI_READ_LOCAL_SUPPORTED_COMMANDS_COMMAND
DEBUG:bumble.host:### CONTROLLER -> HOST: HCI_COMMAND_COMPLETE_EVENT:
num_hci_command_packets: 1
command_opcode: HCI_READ_LOCAL_SUPPORTED_COMMANDS_COMMAND
return_parameters:
status: HCI_SUCCESS
supported_commands: 2000800000c0000c0000e40000002822000000000000040000f7ffff7f00000030007ef6ffffff0720e4ffff0740000000000000000000000000000000000000
DEBUG:bumble.host:### HOST -> CONTROLLER: HCI_LE_READ_LOCAL_SUPPORTED_FEATURES_COMMAND
DEBUG:bumble.host:### CONTROLLER -> HOST: HCI_COMMAND_COMPLETE_EVENT:
num_hci_command_packets: 1
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