Hello Aswin,
The AS Help entry for 29054 indicates the issue, it is not possible to repartition the 4PPC80 via online connection (which is a Hypervisor target under UEFI boot).
B&R Online Help - Error 29054 (br-automation.com)
You will need to setup a USB install drive. See the instructions under Updating/Installing with Automation Studio and USB flash drive.
B&R Online Help - PPC80 Installing/Upgrading Software (br-automation.com)
-Austin