What ImgBurn was about to do, was to check if the burned disc was ok by verifying it. A burn can be reported as good by the burner, but still the disc can be unreadable. The verify part of the burn, checks that.
Can you post the full log? The stuff before this line also.
The Nec 2510 was not a great burner with cheap DL media.
That disc media code might not be very well supported in the firmware.
If you alreaddy have an ISO file, you don't need the build mode. That mode is only when you have the files in the native format and want to create an ISO file.
Follow this guide to burn your ISO file.
http://forum.imgburn.com/index.php?showtopic=61
According to NEC it should support both -R and +R discs.
http://support.necam.com/optical/specs/nd-1100a.pdf
Edit:
You are right, it only supports +R media. I'm reading as the the devil reads the Bible.
The Nec 1300 was the first one that supports both formats.
How big is that ISO file. It might require a double layer disc and that burner doesn't support those.
Can you post how many sectors the iso file is? You should see this in the upper right corner of the program.
1. Best is to cut between two VTS; so I would go for the VTS_04_0.IFO
2. Looks to me as the VTS_04 holds no video. Might be a fake VTS that's been removed during the rip There is's even a menu video file for that VTS.
IFO/BUP files are text based script files. You can use IFOEdit to look at them and you get an idea what they do/contain.
http://www.ifoedit.com/