Victron_SmartSolar_Charger_MPPT_100/50 Canbus sensor error

I am getting a canbus alarm, from my SmartSolar

{
“state”: “warn”,
“message”: “No contact with sensor for 80.565 seconds”,
“method”: [
“visual”,
“sound”
]
}

I have no idea what it means, other than the obvious it is not reaching some sensor or another, it seems to be still charging, can anyone tell me what it means?