Songverter Stops always when working on song 508

[karaokeviva]

Hello everybody!
I just bought Songverter yesterday. I have 4000 kma karaoke songs that I want to convert to ZIP karaoke files. My problem is when SOFTWARE is exactly working on song number 508 software stops.

I see a window that it say:
Music file converter has encountered a problem and needs to close.
We are sorry for the inconvenience. "send or not send report"

I have repeated same process 3 times continuing with the rest of songs and same thing software STOPS on file number 508.

If you question is? when it stops is the same file??? THE ANSWER IS NO.
So until now I have converted only 1500 songs closing the software and start it again 3 times. I am tired and confused.