The workflow failed to start due to an internal error

I was working on an Office 365 environment building some workflows when they all stopped working and I started getting the error:

"The workflow failed to start due to an internal error"

A quick fix was to go to

C:\Users\<profile name>\AppData\Local\Microsoft\WebsiteCache

(note: you may need to allow hidden folders to be displayed)

Find the name of the site you are working on and rename the folder.

All started working again :)

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