fixed import error

app.py

@@ -2,7 +2,6 @@ import gradio as gr
 import os
 from llama_index.core import Settings
 from documents_prep import load_json_documents, load_table_documents, load_image_documents
-from main_utils import get_llm_model, get_embedding_model, get_reranker_model, answer_question
 from my_logging import log_message
 from index_retriever import create_vector_index, create_query_engine
 import sys