If you’ve ever run into or received this error message from Salesforce you know how frustrating it can be to not know right away which flow this is referring to.
The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed to execute the flow with version ID 301A0000000TizV. Flow error messages: <b>An unhandled fault has occurred in this flow</b>An unhandled fault has occurred while processing the flow. Please contact your system administrator for more information. Contact your administrator for help.
Here is one way to find out which flow this is referring to. Open the Developer Console and navigate to Query Editor. Type the following query, plugging in the id from the error message:
select masterlabel from flow where id = '301A..........V'
Make sure you check the “Use Tooling API” checkbox at the left bottom of the screen. Click Execute. This will return the label for the flow or process builder. Voila!