n_splits=10 cannot be greater than the number of members in each class error

Question

I'm trying to build validation curve that relying on max_depth but keep getting an error:

n_splits=10 cannot be greater than the number of members in each class.

I tried to put n_splits with different values, error doesnt change. I got data from .cvs file with numeric data

Here is code fragment that gets error:

from sklearn.tree import DecisionTreeClassifier
    model = DecisionTreeClassifier(random_state=123)
    cv = StratifiedKFold(n_splits=5, shuffle=True, random_state=132)
    train_scores, valid_scores = validation_curve(model, X, y, param_name="max_depth", n_jobs=-1,
       param_range=np.arange(1, 20), cv=10, scoring="accuracy")

Im working in Jupiter Lite.