The user is root. OPatch cannot continue if the user is root.

I want apply Patch 12419353 - 11.2.0.2.3 GI Patch Set Update (Includes Database PSU 11.2.0.2.3) for HP-UX Itanium.

I have installed new Opatch version 11.2.0.1.6.

In GI home the patch must be install with root user, but when I invoke opatch with root I get this error:

sdbtte02:/homeroot#> opatch
Invoking OPatch 11.2.0.1.6
The user is root. OPatch cannot continue if the user is root.

OPatch failed with error code 255

Thanks in advance for any input on this subject