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.