KeyError [...77789,77790] index not found error when I put AutoML in sklearn pipeline and run it

Code:

categorical_transformer = Pipeline(steps=[('one_hot', OneHotEncoder())])
categorical_features = ['merchant_category', 'merchant_group',"name_in_email"]

preprocessor = ColumnTransformer(
transformers=[
('cat', categorical_transformer, categorical_features)
])

clf = Pipeline(steps=[('missing', fill_missing()),
('outlier', outlier_filling()),
('preprocessor', preprocessor),
('classifier', AutoML())])

clf.fit(X_train, y_train)

Note: It works when RandomForestClassifier is replaced with AutoML.