Oracle APEX 19.2 moving application to another host

I exported an application from one oracle apex 19.2 host and sucessfuly imported it to another oracle apex 19.2 host. But when I start the application, I get the following error:

You are not authorized to view this application, either because you have not been granted access, or your account has been locked. Please contact the application administrator.
Access denied by Application security check

Technical Info (only visible for developers)
is_internal_error: true
apex_error_code: APEX.AUTHORIZATION.ACCESS_DENIED
component.type: APEX_APPLICATION_AUTHORIZATION
component.id: 14644239902526063
component.name: Reader Rights

So what could be the problem? Thanks.

Solution

Validate Security Attributes in your application. If you're using Access Control User Role Assignments for Source for Role or Group Schemes, you need to add the roles and propers users in Shared Components -> Application Access Control.

Edit Security Attributes