Update app.py

app.py

@@ -42,10 +42,11 @@ MODEL_NAME  = "gpt-4"
 
 def invoke(openai_api_key, use_rag, prompt):
     if (openai_api_key == ""):
-        print(use_rag)
-        raise gr.Error("'OpenAI API Key' is required.")
+        raise gr.Error("OpenAI API Key is required.")
+    if (use_rag is None):
+        raise gr.Error("Retrieval Augmented Generation is required.")
     if (prompt == ""):
-        raise gr.Error("'Prompt' is required.")
+        raise gr.Error("Prompt is required.")
     try:
         llm = ChatOpenAI(model_name = MODEL_NAME, 
                          openai_api_key = openai_api_key,