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Ric Betros-MatthewsRic Betros-Matthews 

I'm getting an error message when trying to add a product or choose a price book for a trailhead module. It says: unexpected exception while validating invocable actions requests. Can anyone explain why?

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SandhyaSandhya (Salesforce Developers) 
Hi,
 This might be due to pre existing configuration that you might have done for other challenges I would suggest you create new trailhead playground and do challenge.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya
 
 
Kevin HartKevin Hart
Make sure there isn't a synced quote (there cannot be when switching price books that already have products. Either remove the products manually or remove the quote first). If that doesn't work switch to classic and you will get a more meaningful error message.