Error Installing ESXi on Dell R720

• I was working in a datacenter with an administrator and got this error while trying to upgrade ESXi host.

• Later on did everything and came up with the solution to delete the RAID on which ESXi was installed and re-create the RAID. 
• Even after re-creating the RAID for ESXi installation it did not work.
• Later on, I realized to verify that the RAID that we have created was not initialized.
• Post reinitialization it worked and ESXi was installed.
• Here are some screenshots of RAID initialization:-

RAID Initialization - Dell PERC