I have a problem with Volume Manager 3.5 under HP-UX 11.23

I am trying to convert a LVM volume group to VxVM. When I run the vxvmconvert
utility I continue to get this message:

Cannot get dmpnode

For every disk on the system.

I am connected to a EMC Clariion CX700 with Fail Over mode set to 2 with
No Tresspass.

I installed the CX600 ASL released on March 29, 2005

PowerPath is not installed and this is the base product not the full release
of VxVM.

Any assistance would be appreciated.

Thanks,

Al