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Herbert ThorntonHerbert Thornton 

I can't finish my trailhead exercise. "Error: There is already a field named Support_Plan_Start_Date" on Account

SandhyaSandhya (Salesforce Developers) 
Hi,
Check if you already have field "Support_Plan_Start_Date" unde fields of Account object.

Also I would suggest you try in new trailhead playground to avoid the conflicts.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya