ルートアクティビティの DisplayName が空です。ルートアクティビティの DisplayName に NULL や空の文字列を設定したり、WorkflowService の Name を指定しないでください。

Message in Japanese (日本語)

Unlocalized message

Root activity has empty DisplayName. Please do not set root activity's DisplayName to null or empty string, or provide a Name for the WorkflowService.

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