at_host:Error while processing AT Command

[helen]

Hi

Problem description：

                                    In application serial_lte_modem ,When sending AT command  "AT + CFUN?"， return"at_host:Error while processing  AT command:",What caused this？Thank you！

[Amanda Hsieh]

Hi, 

I would suggest to use nRF Connect LTE Link Monitor, and run AT+CFUN=1 before AT+CFUN?. If it still cannot work, please provide the log. 

Regards,
Amanda