I have created workflow using functions, both functions are running individually fine. They both run under 4 seconds. IF I run as user from UI, only first function runs, and error stating something went wrong is not helping to understand issue.

 I created schedule to run this workflow. However, there I see no problem, 

How can we test our workflows if they are failing to run as user from UI ? 

And can there be more specific error stating what exactly went wrong.