where is locate this OID.

Im trying to use SNMP to read and make graphs with cacti.
Im using a script in php, download from the cacti page, and i found some problems with it.

I dont found this value: 1.3.6.1.4.1.14988.1.1.1.1.1.5 for my release of software “MikroTik RouterOS 5.26”

¿any idea?

Not sure what that OID points to, but here is a Wiki page on how to find the OIDs on your router. http://wiki.mikrotik.com/wiki/Manual:SNMP