@ubi-mark Thank you for your response. Thanks for the reference article. My console is PS4. I did reinstall the game twice. I did not try to reset the console at the fear of losing all game saves. My Valhalla disc serial number is CUSA-18535. Can it cause the problem?
I have physical disc of ac valhalla. last night i bought seasons pass from my US playstation account. but dlc is not installing. it says, "waiting to install". when i try to install manually, it says, "application not found." Any help?