Update app.py

app.py

@@ -91,7 +91,7 @@ async def chat(request: ChatRequest):
                     model="gemini-2.0-flash",
                     contents=summarize_prompt,
                     config=GenerateContentConfig(
-                        system_instruction=["You are a helpful assistant who is an expert at summarization."]
+                        system_instruction=["You are a helpful assistant who is an expert at summarization."],
                         generation_config={
                             "temperature": 0.8,
                             "max_output_tokens": 256, # Set your desired maximum output tokens here