Update app.py

app.py

@@ -1,9 +1,9 @@
 import sys
 import os
 import re
-import streamlit as st
+import shutil
 import time
-
+import streamlit as st
 sys.path.append(os.path.abspath("."))
 from langchain.chains import ConversationalRetrievalChain
 from langchain.memory import ConversationBufferMemory
@@ -22,6 +22,14 @@ if not OPENAI_API_KEY:
     st.error("Critical Error: OpenAI API key not found in the environment variables. Please configure it.")
     st.stop()
 
+def check_poppler_installed():
+    if not shutil.which("pdfinfo"):
+        raise EnvironmentError(
+            "Poppler is not installed or not in PATH. Install 'poppler-utils' for PDF processing."
+        )
+
+check_poppler_installed()
+
 def load_docs(document_path):
     loader = UnstructuredPDFLoader(document_path)
     documents = loader.load()