I'm trying to create a database. After creating the Table [Design], I've went to the Table [Data] to add items to the database, ran the program to check if the database items show up, they do. Then I stopped debugging, went back to the table to add more information to the same item, but after adding more information and going on to create another item, I get this error: (Photo Attachment)
In the second photo, when I hover the mouse cursor on the red exclamation point, it gives me the reason of the error, but I don't know how to fix it.
Why is this happening and how could I fix this?