If you see the error message “START.COB program missing or inaccessible” when launching RollMaster Start, the issue is usually due to an incorrect or missing Customer Key verification in the RollMaster Start settings. This Customer Key is a unique code provided by RollMaster support that ensures your workstation can connect properly.
How to resolve the START.COB error
Open RollMaster Start — double‑click the RollMaster Start icon on your desktop.
Click the green Settings icon in the RollMaster Start window.
Select Verify Settings.
In the Customer Key field, paste the Customer Key code you received from RollMaster support.
Click Check.
If the key is verified successfully, you’ll see a green check mark.
Click Save, close the settings, and then try opening RollMaster again.
This process confirms that your Customer Key is valid and accessible, which resolves the missing or inaccessible START.COB program error.
💡 Tip
The Customer Key ensures that your RollMaster Start installation can authenticate and connect properly. If this code is missing, incorrect, or hasn’t been verified, RollMaster Start won’t be able to load necessary program components — which triggers the error you’re seeing