Dataverse Access Error

[chickennanban]

Hi, I have created a canvas app backed by Dataverse table.

But when accessing the app with different user, the apps gives me below error:

"You don’t have access to the data. Server ApprovalFlowMaster(Dataverse table name) response failed(In Japanese). the user with id --- has not been assigned any roles"

I've shared the app with all the users.

The user I've been using doesn't belong to any security groups, and I think there is no security group in the environment. 

All the users have the Power Apps license (Free one).

I don't understand what causes this error. Am I missing something? Thank you.