Issue running Test.py (invalid literal for int() with base 10: 'Private')

[PrashanthRajappan]

I am trying to run test.py (https://www.deploymachinelearning.com/serve-ml-models/) and I am getting the error pasted below.I have tried debugging and finding the issue .Please help as i am stuck there for sometime.

(venv) PS F:\pr_project\Django\MLwDjango\backend\server> python manage.py test apps.ml.tests
Found 1 test(s).
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
Path to artifacts: ../../research/
Values fill missing: {'age': 31.0, 'workclass': 'Private', 'fnlwgt': 121124, 'education': 'HS-grad', 'education-num': 9.0, 'marital-status': 'Married-civ-spouse', 'occupation': 'Prof-specialty', 'relationship': 'Husband', 'race': 'White', 'sex': 'Male', 'capital-gain': 0.0, 'capital-loss': 0.0, 'hours-per-week': 40.0, 'native-country': 'United-States'}
Encoders: {'workclass': LabelEncoder(), 'education': LabelEncoder(), 'marital-status': LabelEncoder(), 'occupation': LabelEncoder(), 'relationship': LabelEncoder(), 'race': LabelEncoder(), 'sex': LabelEncoder(), 'native-country': LabelEncoder()}
Model: RandomForestClassifier()
Preprocessing input data...
Filled missing values:
age workclass fnlwgt education education-num marital-status occupation relationship race sex capital-gain capital-loss hours-per-week native-country
0 37 Private 34146 HS-grad 9 Married-civ-spouse Craft-repair Husband White Male 0 0 68 United-States
Encoding column: workclass
Error occurred in compute_prediction:
invalid literal for int() with base 10: 'Private'
.

Ran 1 test in 0.828s

OK
Destroying test database for alias 'default'...