apex application page not found - oracle

I created an empty application with project sample database in apex with administration and access control features.
Every time I create a new page for a table and want to run it, the page does not appear in navigation menu and when I run it from page editor an error occurs. (Report, master Report and etc.)
This problem does not happen in another applications I have.
Does anyone know why?

Something went wrong with the application creation process (perhaps an error occurred) or afterward to the application metadata (corrupted somehow).
When I created another new application, it worked fine.

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Oracle APEX: Reset session on every application launch?

My use case is actually from the standpoint of an Oracle APEX developer. I'm on version 18.2.
I am working on a single-page application. Every time I run my APEX application from Page Designer, I want the session state of my application to essentially reset. Item values should all start out as NULL, or at their defaults.
I've been playing with a Dynamic Action on Page Load, but that's overkill: if I'm testing multi-step series of operations, simulating an end user, across those actions I want session state retained. But every time I make development changes in Page Designer and then click the "Run" button to launch my application, I want a clean slate.
Is it possible? How do I go about it?
Thanks.
How about a simple workaround?
I understand this is a one-page application. Let's call it Page 1. OK, that's what the final result will be.
But, for testing purposes, create another page (Page 2) and a button on it which will perform redirection to page in this application (the one you're working on - Page 1).
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This is a really strange problem. I have an application that I build using Codeigniter 3, HMVC, and Ion Auth. It was working well until I migrated it from one server to another. Now the data in the session is cleared after 3 navigations.
I tested it by logging into the application and watching the data field in the ci_session table as I navigated. I made it as simple as possible. I perform a browser refresh from the view I reach after login. On the third refresh, the data disappears from the database for my session and the application sends me back to the login page (application checks to see if the user is logged in). I even waited awhile (less than the 7200) to see if it was a time out and the time between refreshes does not seem to matter. I did not add code, because I do not know what code would help.
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I've seen that too and sometimes had to add view.refresh() code to refreshes the view after changes. Thing to check:
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Make sure the Indexer task is running on the server.

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My problem is with the landing page of my web application.
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