Have you been able to burn other discs in the past without issues? Are you trying to copy an existing disc or trying to create a new Blu-ray disc?
In attempt to fix this issue, please try the steps below:
Uninstall ExpressBurn, then delete 3 folders named "ExpressBurn" and 1 named "Components" from these locations:
**C:\Users\<username>\AppData\Roaming\NCH Software\ExpressBurn\
**C:\Program Files (x86)\NCH Software\ExpressBurn\
**C:\Program Files (x86)\NCH Software\Components
**C:\ProgramData\NCH Software\ExpressBurn\
**If you can't find any of the folders, just continue.
After that, restart your computer and reinstall the program
Once done, restart your system one more time and register the program using your current registration code.