No Trap Parser defined for received trap

No Trap Parser defined for received trap

Hello,
 
I'm trying to receive readable traps from our Aruba 3200 Wireless controller. I've already loaded every MIB file I could find related to this controller. I've added the MIB files to the MIBSTOBELOADED.CONF file, but somehow the traps are still unreadable. See screenshot.
 
How can I get the traps to appear in readable text instead of OID and Variable Bindings values?
 
Regards,
Aico

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