C5W1A2 Error in sample

I got the expected value but the grader shows me this error. Can anyone please explain me what happened? Thank you

I decided to reload the original version of the notebook and the issue was solved. Thank you!

It’s good to hear that you found the solution under your own power. Yes, it looks like the code in that test cell somehow got damaged. You must accidentally have typed a carriage return when your cursor was positioned over that line and broke it into two pieces.

For anyone else who sees this, there are instructions for getting a clean copy of any assignment on the DLS FAQ Thread.