KeyError: 'User_ID' In: /Data-Analysis/bayesian-lr/Bayesian Linear Regression Demonstration

[banshiv]

When running following cell:
exercise = pd.read_csv('data/exercise.csv')
calories = pd.read_csv('data/calories.csv')
df = pd.merge(exercise, calories, on = 'User_ID')
df = df[df['Calories'] < 300]
df = df.reset_index()
df['Intercept'] = 1
df.head()

KeyError: 'User_ID'

When I inspect data/exercise.csv, it only reads following:
version https://git-lfs.github.com/spec/v1
oid sha256:aaae7b1c1502cab499ef7b68ddc118d13596b47855968a142a6db1424eba13c9
size 230245

I guess the data from csv is missing.