Authentication failed on dopamine jailbroken device

[CilantroCDH]

Authentication failed.
Try specifying -u/--username and/or -P/--password

I changed my account and password and still got the error:
./dump.py -u mobile -P xxx com.xxx

Start the target app com.xxx
unexpected error while resuming process: (os/kern) failure

[Kuicy]

you can try the below command:
./dump.py -umobile -Pxxx com.xxx