You will want to upgrade your 3.0.1 OVM Manager to the latest patch release 3.0.2.
Download the patch from http://support.oracle.com and the patch is called p13036236_30_Linux-x86-64.zip
Unzip and copy the iso to your OVMM machine.
mount -o loop OracleVM-Manager-3.0.x.iso /OVMCD
cd /OVMCD
./runUpgrader.sh