Nero is correct in what it says, that drive, the Matshita BD-CMB UJ160, cannot write to Blu-ray discs, it can only read them... It can write to DVD and CD media. Asus support is also correct, the drive is "Blu-Ray compatible", meaning it can read Blu-Ray discs but not write to them. This is a common type of optical drive in modern laptops, hence the name "combo", it is a combo DVD-R/RW read/writer and a Blu-Ray reader.
Drive : MATSHITA BD-CMB UJ160B Type : Blu-ray COMBO DL Buffer Size : 2 MB Mechanism : Tray Interface : SATA-1 Read Speed : BD: 6x, DVD: 8x, CD: 24x Write Speed : DVD-R: 8x max. DVD+R: 8x max. DVD-RW: 6x max. DVD+RW: 8x max. DVD-R DL: 6x max. DVD+R9: 6x max. DVD-RAM: 5x max. CD-R: 24x max. CD-RW: 24x max Read CD Text : Yes Return C2 Pointers : Yes Read CD-R : Yes Read CD-RW : Yes Read DVD-ROM : Yes Read DVD-RAM : Yes Read DVD-R : Yes Read DVD-RW : Yes Read DVD-R DL : Yes Read DVD+R : Yes Read DVD+RW : Yes Read DVD+R DL : Yes Read BD-ROM : Yes Read BD-R : Yes Read BD-RE : Yes Read HD DVD-ROM : No Read HD DVD-R : No Read HD DVD-R DL : No Read HD DVD-RAM : No Read HD DVD-RW : No Read HD DVD-RW DL : No Read HD-BURN : Yes Read Digital Audio : Yes Read CD+G : Yes Read VideoCD : Yes Write CD-R : Yes Write CD-RW : Yes Write DVD-R : Yes Write DVD-RW : Yes Write DVD-R DL : Yes Write DVD+R : Yes Write DVD+RW : Yes Write DVD+R DL : Yes Write DVD-RAM : Yes Write BD-R : No Write BD-RE : No Write HD DVD-R : No Write HD DVD-R DL : No Write HD DVD-RAM : No Write HD DVD-RW : No Write HD DVD-RW DL : No Write HD-BURN-R : No Write HD-BURN-RW : No Buffer Underrun Protection : Yes Mount Rainier : No SolidBurn : No Labelflash : No LightScribe : No Modes : Pa, LTA, LDA, LSA, LRA, LRA, LRA If you look at the write capabilities, they are all "No" for Blu-ray (BD). It can read Blu-ray, however. You are doing nothing wrong, your computer and Nero are working properly, it is just not capable of what you are trying to do.