SQLite3 UNIQUE constraint failed error

Question

I am trying to create a database which allows users to create \'to do\' lists and fill them with items to complete. However, when inserting data into the tables it gives me

Answer 1

You have set list_id to be the primary key on the list table, which means that value must be unique for each record. Trying to insert multiple records with the same list_id table is therefore causing the error.

The issue is the same for the item table.