Error: PANDAS.ERRORS.PARSERROR: ERROR TOKENIZING DATA. C Error: Expected 1 Fields in Line 5, Saw 9

Trying to read a TSV file in Pandas.

import pandas as pd
df = pd.read_csv(filename, sep='\\t')
print(df)

After executing this code, I see an error in the console:

df = pd.read_csv(filename, sep='\\t')
File "/Library/Frameworks/Python.framework/Versions/3.6/Lib/Python3.6/Site-packages/pandas/io/parsers.py", line 655, in parser_f
    return _read(filepath_or_buffer, kwds)
File "/Library/Frameworks