bugfix

app.py

@@ -30,7 +30,9 @@ def process_image(image_input, task_prompt, text_input) -> Optional[Image.Image]
     if not image_input:
         gr.Info("Please upload an image.")
         return None
-
+    if not task_prompt:
+        gr.Info("Please enter a task prompt.")
+        return None
     if not text_input:
         gr.Info("Please enter a text prompt.")
         return None
@@ -72,7 +74,7 @@ with gr.Blocks() as demo:
                     "<CAPTION_TO_PHRASE_GROUNDING>", 
                     "<OPEN_VOCABULARY_DETECTION>", 
                     '<DENSE_REGION_CAPTION>'
-                ], value="<CAPTION_TO_PHRASE_GROUNDING>", multiselect=True, label="Task Prompt", info="task prompts"
+                ], value="<CAPTION_TO_PHRASE_GROUNDING>", label="Task Prompt", info="task prompts"
             ),
             text_input_component = gr.Textbox(label='Text prompt', placeholder='Enter text prompts')
             submit_button_component = gr.Button(value='Submit', variant='primary')