Getting KeyError for pandas df column name that exists

Question

I have

data_combined = pd.read_csv("/path/to/creole_data/data_combined.csv", sep=";", encoding='cp1252')

So, when I try to access these rows:

data_combined = data_combined[(data_combined["wals_code"]=="abk") &(data_combined["wals_code"]=="aco")]

I get a KeyError 'wals_code'. I then checked my list of col names with

print(data_combined.columns.tolist())

and saw the col name 'wals_code' in the list. Here's the first few items from the print out.

[',"wals_code","Order of subject, object and verb","Order of genitive and noun","Order of adjective and noun","Order of adposition and NP","Order of demonstrative and noun","Order of numeral and noun","Order of RC and noun","Order of degree word and adjective"]

Anyone have a clue what is wrong with my file?