Couldn't resolve these MibNodes

Hello im getting this error while trying to read a mib file

Error parsing MIB:FW0000020A.MIB
Exception while loading MIB:Could not parse the file C:/PROGRA~1/MANAGE~1/OPMANA~1/./mibs/FW0000020A.MIB. Couldn't resolve these MibNodes : { snmp }

How can i fix this

Regards