Invalid Slug (check50)

Hi guys, how have you been doing?

So I am in week 2 of CS50X right now and through the weeks, I have always used check50 to see the correctness of my work and it has always gone smoothly. Today I was doing the last part of the week's problem set which is CEASAR, and all of the sudden, it kept showing this message. It is important to note that I am using the cloud version of VS Code (CS50.dev). Please help me, I have no prior experience in programming and don't really know my way around the UI. Thanks in advance everybody. All love 🤍🖤