fixed issue of Knowledge base not initialized

Signed-off-by: RAWx18 <rawx18.dev@gmail.com>

Author: RAWx18

src/mvt/main.py

@@ -43,6 +43,16 @@ def get_ragchain(filter):
             temperature=0.7
         )
 
+    # Check if vector database exists
+    persist_dir = config_data["persist_directory"]
+    index_path = os.path.join(persist_dir, "index.faiss")
+    
+    if not os.path.exists(index_path):
+        raise FileNotFoundError(
+            f"Vector database not found at {index_path}. "
+            "Please run 'python ingest.py' first to create the knowledge base."
+        )
+
     # Load local vector db
     docsearch = FAISS.load_local(config_data["persist_directory"], embeddings, allow_dangerous_deserialization=True)
 

src/mvt/pages/chatbot.py

@@ -31,7 +31,24 @@
     filter = {"access": {"$eq": "public"}}
 
 
-rag_chain = get_ragchain(filter)
+try:
+    rag_chain = get_ragchain(filter)
+except FileNotFoundError as e:
+    st.error("⚠️ Knowledge base not initialized!")
+    st.info("""
+    The AI FAQ system needs to be set up first. Please:
+    
+    1. Add your documents/links to the Config public/private page first.
+    2. Then update the knowledge base from Build Knowledge Base page.
+    3. Then open this page again.
+    
+    Or contact an administrator to set up the knowledge base.
+    """)
+    st.stop()
+except Exception as e:
+    st.error(f"Error initializing the system: {str(e)}")
+    st.stop()
+
 username = st.session_state.username
 
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