[Question] In sk-learn random forest regression, an error occurs when the number of parallels is set to -1.

Premise

I'm trying to load a csv file with pandas and do a random forest regression with sk-learn. On the referring site, n_jobs of the following code was **-1 **, so when I copied it as it was, the following error was thrown.

sklearn.externals.joblib.my_exceptions.JoblibValueError: JoblibValueError

Here's the code that works fine:

r_forest = RandomForestRegressor(
    n_estimators=100,
    criterion='mse',
    random_state=1,
    n_jobs=1,
)

r_forest.fit(X_train, Y_train) #I get an error here
y_traing_preq = r_forest.predict(X_train)
y_test_preq = r_forest.predict(X_test)

I would appreciate it if anyone could teach me.

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