Update app.py

app.py

@@ -42,15 +42,24 @@ def load_pdf(file_path):
     return documents
 
 def prepare_vectorstore(data):
+    index_dir = "faiss_index"
+    if not os.path.exists(index_dir):
+        os.makedirs(index_dir)
     text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=20, separator="\n")
     texts = data
     vectorstore = FAISS.from_texts(texts, embeddings)
-    vectorstore.save_local("faiss_index")
+    vectorstore.save_local(index_dir)
     
     return vectorstore
 
 def load_vectorstore():
-    vectorstore = FAISS.load_local("faiss_index", embeddings, allow_dangerous_deserialization=True)
+    index_dir = "faiss_index"
+    
+    # Ensure the directory exists before trying to load the index
+    if not os.path.exists(index_dir):
+        raise RuntimeError(f"FAISS index directory '{index_dir}' does not exist.")
+
+    vectorstore = FAISS.load_local(index_dir, embeddings, allow_dangerous_deserialization=True)
     return vectorstore
 
 def create_chain(vectorstore):