Getting a Request Error 404 in Python while accessing an API

Previously, I used a Morningstar API to get stock data; however, now that I am away from USA for a week, I am not being able to access the data.

This is the code snippet:

import datetime as dt
from dateutil.relativedelta 
import relativedelta
import matplotlib.pyplot as plt
from matplotlib import style
import pandas as pd
pd.core.common.is_list_like = pd.api.types.is_list_like
import pandas_datareader.data as web
import csv
from mpl_finance 
import candlestick_ohlc
import matplotlib.dates as mdates
from matplotlib.dates import DateFormatter, MonthLocator, YearLocator,    DayLocator, WeekdayLocator
style.use( 'ggplot' )


end = dt.date.today()

start_48 = end - relativedelta( years=4 )
start_120 = end - relativedelta( years=10 )

ticker = input( 'Ticker: ' ) #should be in Uppercase
ticker = ticker.upper()

df_w = web.DataReader( ticker, 'morningstar', start_48, end )
df_m = web.DataReader( ticker, 'morningstar', start_120, end )


print()

file_name_w = ticker + 'weekly.csv'
file_name_m = ticker + 'monthly.csv'
df_w.to_csv( file_name_w )
df_m.to_csv( file_name_m )

df_w = pd.read_csv( file_name_w, parse_dates=True, index_col=0 )
df_m = pd.read_csv( file_name_m, parse_dates=True, index_col=0 )

This is the error message:

Ticker: spy
Traceback (most recent call last):
File "/Users/zubairjohal/Documents/OHLC.py", line 24, in <module>
df_w = web.DataReader( ticker, 'morningstar', start_48, end )
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas_datareader/data.py", line 391, in DataReader
session=session, interval="d").read()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas_datareader/mstar/daily.py", line 219, in read
df = self._dl_mult_symbols(symbols=symbols)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas_datareader/mstar/daily.py", line 130, in _dl_mult_symbols
resp.status_code, resp.reason))
Exception: Request Error!: 404 : Not Found

Is it an IP issue, and is there a way to fix this? I know that this code is fine because it worked perfectly well two days ago.