update

app.py

@@ -40,11 +40,21 @@ def bot(
     if not google_key:
         raise ValueError("GOOGLE_API_KEY is not set. Please set it up.")
 
-    text_prompt = chatbot[-1]["content"].strip() if chatbot[-1]["content"] else None
+    # Extract text content from message (handle both string and list formats)
+    content = chatbot[-1]["content"]
+    if isinstance(content, list):
+        # In multimodal format, content is a list of items
+        text_prompt = None
+        for item in content:
+            if isinstance(item, str):
+                text_prompt = item.strip()
+                break
+    else:
+        text_prompt = content.strip() if content else None
 
     # Handle cases for text and/or image input
     if not text_prompt and not image_prompt:
-        chatbot[-1]["content"] = "Prompt cannot be empty. Please provide input text or an image."
+        chatbot[-1]["content"] = [{"type": "text", "text": "Prompt cannot be empty. Please provide input text or an image."}] if isinstance(chatbot[-1]["content"], list) else "Prompt cannot be empty. Please provide input text or an image."
         yield chatbot
         return
     elif image_prompt and not text_prompt: