To resolve this issue, try burning at lower speed:
1. Open RealPlayer.
2. Click the RealPlayer logo in the upper left and select Preferences.
3. On the left, you should see CD. Expand this by clicking the + symbol.
4. Click CD Burning.
5. Adjust the Write Speed. Decrease this to the smallest value. Generally, 4X should be fine. You can adjust this to a higher speed once you get it working at a lower speed.
If the issue persists, try performing a clean uninstall and re-install of RealPlayer by following the article: