Answer same as solution but won't run

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I ran the solution for step 4:
train['years_until_remod'] = train['Year_Remod/Add'] - train['Year Built'] and it didn’t run, but when I pasted the solution, it ran. No difference in spacing.

Hello @feedmyboxtoday,

The error is here:

The column name is 'Year Remod/Add' so it should be train['Year Remod/Add'] NOT train['Year_Remod/Add']

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Ah, thanks. Yes, the underscore was wrong.