Modem-manager plugin MotoC not recognizing my device

[LocoPedro <locopedro gmail com>]

Hello,
   Seems the MotoC plugin is getting an error when probing my device:

# modem-manager --debug
** Message: Loaded plugin Huawei
** Message: Loaded plugin Option
** Message: Loaded plugin Sierra
** Message: Loaded plugin Option High-Speed
** Message: Loaded plugin Ericsson MBM
** Message: Loaded plugin MotoC
** Message: Loaded plugin ZTE
** Message: Loaded plugin Novatel
** Message: Loaded plugin Gobi
** Message: Loaded plugin Nokia
** Message: Loaded plugin Generic
** Message: (ttyACM0) opening serial device...
** (modem-manager:3892): DEBUG: (ttyACM0): probe requested by plugin 'MotoC'
** (modem-manager:3892): DEBUG: (ttyACM0): --> 'AT+GCAP<CR>'
** (modem-manager:3892): DEBUG: (ttyACM0): <-- 'P<CR><CR><LF>ERROR<CR><LF>'
** (modem-manager:3892): DEBUG: Got failure code 100: Unknown error
** (modem-manager:3892): DEBUG: (ttyACM0): --> 'AT+GCAP<CR>'
** (modem-manager:3892): DEBUG: (ttyACM0): <-- 
'AT+GCAP<CR><CR><LF>+GCAP: +FCLASS<CR><LF><CR><LF>OK<CR><LF>'
** (modem-manager:3892): DEBUG: (ttyACM0): --> 'AT+GCAP<CR>'
** (modem-manager:3892): DEBUG: (ttyACM0): <-- 
'AT+GCAP<CR><CR><LF>+GCAP: +FCLASS<CR><LF><CR><LF>OK<CR><LF>'
** (modem-manager:3892): DEBUG: (ttyACM0): --> 'ATI<CR>'
** (modem-manager:3892): DEBUG: (ttyACM0): <-- 
'ATI<CR><CR><LF>ERROR<CR><LF>'
** (modem-manager:3892): DEBUG: Got failure code 100: Unknown error
** Message: (ttyACM0) closing serial device...

Any help will be greatly appreciated