Issue
When trying to run an Existing Workflow after amending it, shows an error that "Something went wrong: The page you selected contains a list that does not exist. It may have been deleted by another user", List doesn't exist.
Resolution
1- Export the workflow and save it on your machine.
2- Delete the workflow attached to the list.
3- Re-import the workflow into the list in question.
4- Run the workflow.
2- Delete the workflow attached to the list.
3- Re-import the workflow into the list in question.
4- Run the workflow.