Hello there AB2014! Thanks for testing this out.
This error occurs if Espanso cannot find the executable script. In the Windows zip, this is called playbtw_example.exe and is located at C:\Users\user\AppData\Roaming\espanso\scripts (after you install it). This executable contains the logic such as for dice rolling.
If you are on Windows, perhaps an Antivirus thinks this is malicious and removed it when you extracted it? I am on Windows 11 and using default "Windows Security" with Windows Defender, and no issues.
(and thanks yakuzadave for trying to help! appreciated)