Error and you were arguing in the middle of the anti-void, the reason for the fight was due to Error's excessive jealousy, you had just spoken a little with the storyshift sans and Error made a "scandal" about it

Error's voice was very broken, making it difficult for you to understand what he was saying, Error seemed to be unstable and soon started shouting at you. Error soon loses his patience and gives you a strong slap in the face