Burning iso file to a DVD using PowerIso causes error

By using PowerIso 4.6, I burned a .iso file to a dvd, then encountered a problem. All is functioning well but the problem occurred when the burning process started. The error is like this:
14:43:24 Error writing data. (439-00000140 99049b5c)
Can anybody help me to solve this problem? Help is very much needed.
PS: I’m working on a Toshiba Satellite L305-S5915 machine. Thanks a lot.
