[fowlplay4]

It means the copy-protection in Graal encountered an error. From what I've read it can be caused by any of the following:

1. Windows installation possibly corrupt.
2. Your computer is infected with malware.
3. Your A/V and/or Firewall is over-sensitive.

You can try:

1. Running Graal in a different compatibility mode.
2. Disable your A/V and/or Firewall and then try running Graal.
3. Scanning your computer for Malware with Malwarebytes Anti-Malware (or other scanners).
4. Restoring Windows to an earlier time.
5. Reinstalling Windows.