The following error text appears when running a SQL Change Automation PowerShell cmdlet or add-on:

 ... Could not start LocalDB: Error occurred during LocalDB instance startup ...

Cause

There are two possible causes of this error:

• You don't have LocalDB installed.
• Your RedGateTemp instance is corrupt (this is a known issue with LocalDB).

Fix

To install LocalDB, do one of the following:

• Reinstall SQL Change Automation using the SQL Toolbelt installer, and make sure your machine has an internet connection. LocalDB will be installed automatically.
• Install LocalDB manually.  Install Local DB 32 bit or Local DB 64 bit depending on your machine.

If the error still persists, fix the corrupt RedGateTemp instance.