Stuck at moving background.jpg to images folder

I’m taking the RDBMS course and I’m stuck at

There’s your new images folder. It’s blue. You can copy a file with cp <file> <destination> . cp stands for “copy”. Copy background.jpg to your images folder.

I have typed cp background.jpg images several times but the test is not passing. Is there something I’m not doing right?

Seems like my tests/settings file is corrupt. Is there a way i can reset this without losing my progress?