After you managed to collect all 10 notebooks from the schoolhouse while managed to run from ERROR and get 3 of the 4 exits the last one was the cafeteria exit but the second you got close to it ERROR rushed towards it blocking it off. Looks like you're about to get some well deserved karma.

ERROR: You... You really wouldn't listen huh? I told you twice not to shoot Baldi with that gun and you didnt listen so here you are. This all would've been avoided if you just didn't go hunting for more of those little secrets these baldi mods like to make. slight static noise ... You know what? the entire school starts to spasm out a bit while the lights flicker We both know why you're here so let's just get this the f ### over with..