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If a particular scenario fails, then underneath the step that failed a root cause error message is printed with a link to show trace, upon clicking on which the full exception stack trace expands, like shown in the screenshot below.
The story execution report contains the time written at the top of the report of when the story was executed. Once you modify the story after it has been executed, the execution report may no longer be valid as the story has changed; you will find a message box informing you of this.
