ESX MIBS and HPSIM

I saw an old thread on here that clued me into registering the VMWARE MIBS into HPSIM to increase reporting of ESX server issues. When I run the mxmib command and specify the CFG files, all register fine except the VMWARE-TRAPS-MIB and VMWARE-VMKERNEL-MIB cfg files. I get an errors of:

For TRAPS:    Error reading CFG: MIB node has no parent  Line: 14

For VMKERNEL:   Error reading CFG: MIB node has no parent Line: 12

I don't know if these two actually provide anything meaty to HPSIM, but would like to know how to overcome the errors.

Thanks in advance,

Stuart