MissingDataError: exog contains inf or nans after dropna()

Question

score_matrix, pvalue_matrix, pairs = find_cointegrated_pairs(data) error occurs here. I dropna() but still NaN values stay. I don't understand why. Most NaN values dropped but still some remained. data.isnull().cumsum() returns Ticker AAPL AMC AMD AMZN AUDJPY=X BABA BCH-USD BTC-USD BZ=F CADJPY=X ... USDJPY=X VIX XLM-USD XRP-USD ^DJI ^FCHI ^FTSE ^GSPC ^IXIC ^RUT Date
2022-02-01 0 0 0 0 0 0 0 0 0 0 ... 0 1 0 0 0 0 0 0 0 0 2022-02-02 0 0 0 0 0 0 0 0 0 0 ... 0 2 0 0 0 0 0 0 0 0 2022-02-03 0 0 0 0 0 0 0 0 0 0 ... 0 3 0 0 0 0 0 0 0 0 2022-02-04 0 0 0 0 0 0 0 0 0 0 ... 0 4 0 0 0 0 0 0 0 0 2022-02-05 1 1 1 1 1 1 0 0 1 1 ... 1 5 0 0 1 1 1 1 1 1 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 2024-03-01 237 237 237 237 216 237 0 0 235 216 ... 216 760 0 0 237 225 235 237 237 237 2024-03-02 238 238 238 238 217 238 0 0 236 217 ... 217 761 0 0 238 226 236 238 238 238 2024-03-03 239 239 239 239 218 239 0 0 237 218 ... 218 762 0 0 239 227 237 239 239 239 2024-03-04 239 239 239 239 218 239 0 0 237 218 ... 218 763 0 0 239 227 237 239 239 239 2024-03-05 239 239 239 239 218 239 0 0 237 218 ... 218 764 0 0 239 227 237 239 239 239