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Most likely, what has happened is that you have run out of room on the first disk. So it wants you to remove that disk and then insert another disk to finish the DvD.
If you do just that, remove the disk and then insert a new blank DVD. Will it continue burning the project ?
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If you are getting a medium write error, you have a bad brand / pack of disks.
Purchase a different brand of disks, ( stay away from sony ) Maxell tend to be defect free. http://amzn.to/1Pd9vnU
Whichever brand of disks you bought, switch to a different brand. ( even if a few at the top of the pack worked)
That will solve the issue!