Burning Error. Nero Won’t Burn DVD-R

Hello ,
I'm using Nero 8.1.1.0 Extra Release. I don't not have any problems recording DVD's in last few days, but just this day, Nero always providing a fault concept through the losing procedure stated that a DVD-R is in the RW device and only get a recording into the DVDR/RW or DVD DL.
I've been using DVD-R always, and nothing issue for several months, but how come I encounter this kind of fault right now? Do I need to establish a solution or not? I am sorry in enhanced with this stupid concern, or been previously resolved?
Also can take place with other items of the Nero 11 technology or the present up-dates for Nero.
