Smarts - 10.1.x
This indicates that the SNMP agent #.#.#.# does not support the OID internet.mgmt.mib-II.system.sysDescr.
It is unlikely to support every system group in MIB-II, and it may not support any MIB-II functionality at all.
This might be a legitimate implementation of SNMP, despite its oddity. But our finding will be partial for this device, as it depends on MIB-II (and the system group in particular).
Customer needs to contact device vendor for updating/implementing SNMP agent to support MIB-II.