Writing to PLEXTOR DVDR PX-708A failed!

I am trying CloneCD ver on my Windows XP system.
I have tried to copy a few CDs. Each reads fine, but when I put in the blank, I get “Writing to PLEXTOR DVDR PX-708A failed!”.

I have tried the same CDs using Roxio and have no problems writing. Does anyone know what might be wrong?