ble_nus_string_send get error NRF_ERROR_INVALID_STATE

[qoboty]

After I receive data by ble_nuts,using example ble_app_uart.

I call ble_nus_string_send to the central, however I got error,I print error code is 8 which means "NRF_ERROR_INVALID_STATE"

how to fix it? or how to send data successfully? Thanks!

I use SDK 9.0.0, SoftDevice 8.0.0

[Petter Myhre]

Are you connected? Have you enabled notifications for the characteristic, is the CCCD 0x0001? Are you using the correct connection handle?