Cache a dataframe ; @st.cache

I’m new to streamlit and have tried my best to look for a solution before posting here.

What I want to do is simple, I am loading a pandas dataframe as .csv, I am using a @st.cache decorator to cache this dataframe. I want to predict a classification by using a predefined classification model(RandomForest, XGBoost), essentially a column will be added to the original dataframe and stored in a new variable. However, I am having issues caching this new dataframe.

import pandas as pd
import numpy as np
from xgboost import XGBClassifier
import streamlit as st

def main():
    st.title('Classification Problem on Home Equity dataset')

if __name__ == '__main__':

#Load prediction data
    def load_predict():
        data= pd.read_csv("hmeq_Predict_2.csv")  #Currently on my local machine
        return data
    df_predict = load_predict()

# Predict on data
    def predictor_func():
        y_pred_nd = pd.Series(model.predict(df_predict),name='BAD')
        Predicted_X = pd.concat([df_predict,y_pred_nd],axis=1)
        #This is the Dataframe that I want cache
        return Predicted_X

#Run XGBoost classification , I have loaded X_train and y_train also, not shown in this example
    if classifier == "XGBoost":
        if st.sidebar.button("Run Classification", key="Classification"):
            model = XGBClassifier() 
           #I want this function to return the cached dataframe.
# This command will correctly display the Dataframe, meaning that the predictor_func() ran correctly

#However, when I want to display the dataframe, Predicted_X, only when I click this button
    if st.sidebar.button("Run Prediction on new Data", key="Prediction"):
        st.subheader('Check last column for prediction. ')

This is the error I get :

Am I missing a key concept here?
Also, is there a way to cache a model from sklearn?