@Risk/DTS: "Automation error: Library not registered"

Excel registry error may occur if old versions left keys behind. Upgrade Excel and remove orphan keys via "Removing Outdated References to Office from the System Registry"

Dec 10, 2025
Knowledge

Title

Answer

Applies to:
All products

Errors:

"Automation error: Library not registered"
Method '~' of object '~' failed

Causes:

An error in the System Registry entries for Excel.
1. Upgrading to the latest version should address it.
If there were multiple versions of Excel installed and one was uninstalled.
1. one or more keys in the System Registry may have been left behind.
2. To remove these "orphan" keys, see Removing Outdated References to Office from the System Registry

Related Article:

Repairing the @Risk/DTS software

URL Name

automation-error-library-not-registered

@Risk/DTS: "Automation error: Library not registered"

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