Burning of Nero CD-Image Fails :/

Basically, when i dbbl click on my nrg file, it opens up my Nero 5.5 and i select the burnm speed and click burn. It goes into the burning screen and then activates seamlessl link. However, it always states “caching of files failed”

when i used alcohol 120% i burned it but it created an mp3 file somehow although i chose to burn it as an image :s

any ideas?