MOC FATAL ERROR: Server exited!


Hello! I'm a beginner in linux. I'm using Debian 9. Kernel version
In a amd64 machine and MOC 2.6.0
When just launch MOC on Command Line, the following error appears:

haganemayumi@HaganeMayumi:~$ mocp
Running the server...
Trying JACK...
Trying ALSA...
mocp: alsa.c:319: alsa_read_mixer_raw: Assertion `RANGE(0, vol, 100)' failed.

FATAL_ERROR: Server exited!

How can I solve this problem?

Turn your volume level to less than 100%.