correct key error

app.py

@@ -15,7 +15,7 @@ def predict(prompt,model_name, max_length):
     summary = model(prompt,max_length)[0]["summary_text"]
     return summary
         
-options_1 = model_name_converter.keys()
+options_1 = list(model_name_converter.keys())
 with gr.Blocks() as demo:
     drop_down = gr.Dropdown(choices=options_1, label="model")
     textbox = gr.Textbox(placeholder = "Enter text block to summarize", lines = 4)