Add Business Logic to a Travel Approval App

"This approval request requires the next approver to be determined by the Manager field. This value is empty. Please contact your administrator for more information

• Add Business Logic to a Travel Approval App - link test your approval process

Please check Manger on your login user. If Manager is blank then it will give same error.
Check you user detail

https://developer.salesforce.com/forums/?id=906F0000000D6RhIAK

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メールは届かないけど合格できた