Check-mk monitoring

Hi I have These Errors
Please guide me
CRIT - no unmonitored services found, no vanished services found, no new host labels, [agent] Communication failed: timed out CRIT , [snmp] Cannot fetch system description OID .1.3.6.1.2.1.1.1.0. This might be OK for some bogus devices. In that case please configure the ruleset “Hosts without system description OID” to tell Check_MK not to fetch the system description and system object OIDs. CRIT

CRIT - no unmonitored services found, 20 vanished services (wmi_cpuload:1, uptime:1, winperf_if:3, winperf_phydisk:1, df:2, logwatch:7, winperf_processor.util:1, services.summary:1, dotnet_clrmemory:1, systemtime:1, mem.win:1), no new host labels, [snmp] Cannot fetch system description OID .1.3.6.1.2.1.1.1.0. This might be OK for some bogus devices. In that case please configure the ruleset “Hosts without system description OID” to tell Check_MK not to fetch the system description and system object OIDs. CRIT