When i started the flows for the process as i took lesson 4, i mistakenly click on a wrong bottom and got this message. Can someone please help me restore my page to what it was before this error (before commencement of the flow assignment) so I can continue with my studies.

Error message

pyProcesses:** Unable to open an instance using the given inputs: TGB-HRApps-Work-ExpenseReport.Review_Flow_0