I need help with entities and domain model

Hello to everyone, I am new with mendix and I have a red check about: " Entity access is out of date. Please upgrade security by checking the" Update security" button in the domain model editor. I don't understand it If someone can explain to me or wants to help a poor student, I will gladly appreciate it. https://kodi.software/ https://dltutuapp.com/tutuapp-download/ 
1 answers

Hi emma,

Upgrade your security by clicking update security in your domain model.