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annapurna penumatchaannapurna penumatcha 

Challenge Not yet complete... here's what's wrong: Couldn’t find a rule 'Start_before_End'.

Best Answer chosen by annapurna penumatcha
SandhyaSandhya (Salesforce Developers) 
Hi,

DO you have a validation rule on Volunteer Shift object? Please see this requirement>
The Volunteer Shift record stores the date and time a shift should complete. This field is required. Build a rule called "Start before End" ensuring that Shift End Time comes after Shift Start Time with the error message, "No time travel allowed during volunteering! Shift Start Time must be before Shift End Time."

You will need a validation rule. 
Shift_End_Time__c < Shift_Start_Time__c

Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.

Best Regards,
​Sandhya