snmp issues

["Mike ." <dmciscobgp () hotmail com>]

ran into these errors when trying out some of the snmp scripts. anyone care to decipher? the uptime one is confusing. 
if it was 0 then why would it just not report that? thanks
m|ke

nmap -v -n -T4 -reason -sU -p 161 24.220.238.251 -script=snmp*

C:\Program Files\Nmap/scripts\snmp-sysdescr.nse:98: attempt to perform arithmetic on local 'uptime' (a nil value)stack 
traceback:        C:\Program Files\Nmap/scripts\snmp-sysdescr.nse:98: in function <C:\Program 
Files\Nmap/scripts\snmp-sysdescr.nse:32>        (...tail calls...)

NSE: snmp-ios-config against 24.220.238.251:161 threw an error!C:\Program Files\Nmap/scripts\snmp-ios-config.nse:198: 
attempt to concatenate local 'result' (a nil value)stack traceback:        C:\Program 
Files\Nmap/scripts\snmp-ios-config.nse:198: in function <C:\Program Files\Nmap/scripts\snmp-ios-config.nse:69>        
(...tail calls...)                                      
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