The localhost does not update with new line of code

Hi, I’m trying to go through the Predicting Income With Social Data Project (https://www.codecademy.com/paths/analyze-data-with-r/tracks/introduction-to-machine-learning-in-r/modules/linear-regression-in-r/projects/predicting-income-psid)

But I’ve encountered a problem, the localhost does not produce the updated line of code. I’ve tried switching browser and resetting the project, but the problem still occurs. Is this a bug or something? Would appreciate any help on this. I’ve been stuck on this hours.

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Very frustrating that you didn’t get any answer. I have the same problem. No answer means that I cannot finish the course.