Magic Contest is a special case because you must create a database in that program BEFORE you can run Magic Contest via the Select Scoring Software menu.
BOS should load the correct database automatically but you are advised to check that the event name is correct at your first usage. In the example to the right the "demo" event has been selected.
You are advised to Report Problem if you have created a database in Magic Contest and get the error message shown to the right. cf. the Magic Contest document.